diff --git a/src/c_cvars.cpp b/src/c_cvars.cpp
index 9681f3ece..81ba01135 100644
--- a/src/c_cvars.cpp
+++ b/src/c_cvars.cpp
@@ -135,7 +135,7 @@ FBaseCVar::~FBaseCVar ()
 void FBaseCVar::ForceSet (UCVarValue value, ECVarType type)
 {
 	DoSet (value, type);
-	if (Flags & CVAR_USERINFO)
+	if ((Flags & CVAR_USERINFO) && !(Flags & CVAR_NOSEND))
 		D_UserInfoChanged (this);
 	if (m_UseCallback)
 		Callback ();
@@ -849,9 +849,7 @@ UCVarValue FStringCVar::GetFavoriteRepDefault (ECVarType *type) const
 
 void FStringCVar::SetGenericRepDefault (UCVarValue value, ECVarType type)
 {
-	if (DefaultValue)
-		delete[] DefaultValue;
-	DefaultValue = ToString (value, type);
+	ReplaceString(&DefaultValue, ToString(value, type));
 	if (Flags & CVAR_ISDEFAULT)
 	{
 		SetGenericRep (value, type);
@@ -1277,7 +1275,7 @@ void FilterCompactCVars (TArray<FBaseCVar *> &cvars, DWORD filter)
 	// Accumulate all cvars that match the filter flags.
 	for (FBaseCVar *cvar = CVars; cvar != NULL; cvar = cvar->m_Next)
 	{
-		if (cvar->Flags & filter)
+		if ((cvar->Flags & filter) && !(cvar->Flags & CVAR_NOSEND))
 			cvars.Push(cvar);
 	}
 	// Now sort them, so they're in a deterministic order and not whatever
@@ -1316,7 +1314,7 @@ FString C_GetMassCVarString (DWORD filter, bool compact)
 	{
 		for (cvar = CVars; cvar != NULL; cvar = cvar->m_Next)
 		{
-			if ((cvar->Flags & filter) && !(cvar->Flags & CVAR_NOSAVE))
+			if ((cvar->Flags & filter) && !(cvar->Flags & (CVAR_NOSAVE|CVAR_NOSEND)))
 			{
 				UCVarValue val = cvar->GetGenericRep(CVAR_String);
 				dump << '\\' << cvar->GetName() << '\\' << val.String;
@@ -1489,6 +1487,7 @@ FBaseCVar *FindCVarSub (const char *var_name, int namelen)
 FBaseCVar *C_CreateCVar(const char *var_name, ECVarType var_type, DWORD flags)
 {
 	assert(FindCVar(var_name, NULL) == NULL);
+	flags |= CVAR_AUTO;
 	switch (var_type)
 	{
 	case CVAR_Bool:		return new FBoolCVar(var_name, 0, flags);
@@ -1540,7 +1539,7 @@ void C_ArchiveCVars (FConfigFile *f, uint32 filter)
 	while (cvar)
 	{
 		if ((cvar->Flags &
-			(CVAR_GLOBALCONFIG|CVAR_ARCHIVE|CVAR_AUTO|CVAR_USERINFO|CVAR_SERVERINFO|CVAR_NOSAVE))
+			(CVAR_GLOBALCONFIG|CVAR_ARCHIVE|CVAR_MODARCHIVE|CVAR_AUTO|CVAR_USERINFO|CVAR_SERVERINFO|CVAR_NOSAVE))
 			== filter)
 		{
 			UCVarValue val;
@@ -1671,14 +1670,16 @@ void FBaseCVar::ListVars (const char *filter, bool plain)
 			else
 			{
 				++count;
-				Printf ("%c%c%c %s : :%s\n",
-					flags & CVAR_ARCHIVE ? 'A' : ' ',
+				Printf ("%c%c%c%c %s = %s\n",
+					flags & CVAR_ARCHIVE ? 'A' :
+						flags & CVAR_MODARCHIVE ? 'M' : ' ',
 					flags & CVAR_USERINFO ? 'U' :
-				flags & CVAR_SERVERINFO ? 'S' :
-				flags & CVAR_AUTO ? 'C' : ' ',
+						flags & CVAR_SERVERINFO ? 'S' :
+						flags & CVAR_AUTO ? 'C' : ' ',
 					flags & CVAR_NOSET ? '-' :
-				flags & CVAR_LATCH ? 'L' :
-				flags & CVAR_UNSETTABLE ? '*' : ' ',
+						flags & CVAR_LATCH ? 'L' :
+						flags & CVAR_UNSETTABLE ? '*' : ' ',
+					flags & CVAR_NOSEND ? 'X' : ' ',
 					var->GetName(),
 					var->GetGenericRep (CVAR_String).String);
 			}
diff --git a/src/c_cvars.h b/src/c_cvars.h
index d7b767f33..744643d82 100644
--- a/src/c_cvars.h
+++ b/src/c_cvars.h
@@ -61,6 +61,8 @@ enum
 	CVAR_GLOBALCONFIG	= 1024,	// cvar is saved to global config section
 	CVAR_VIDEOCONFIG	= 2048, // cvar is saved to video config section (not implemented)
 	CVAR_NOSAVE			= 4096, // when used with CVAR_SERVERINFO, do not save var to savegame
+	CVAR_MODARCHIVE		= 8192,	// cvar will be saved to a mod-specific section of the ini
+	CVAR_NOSEND			= 16384,// do not send cvar across the network (dummy mod cvar)
 };
 
 union UCVarValue
diff --git a/src/d_main.cpp b/src/d_main.cpp
index aa4abd366..0f66f68a6 100644
--- a/src/d_main.cpp
+++ b/src/d_main.cpp
@@ -1358,6 +1358,136 @@ CCMD (endgame)
 	}
 }
 
+//==========================================================================
+//
+// ParseCVarInfo
+//
+//==========================================================================
+
+void ParseCVarInfo()
+{
+	int lump, lastlump = 0;
+	bool addedcvars = false;
+
+	while ((lump = Wads.FindLump("CVARINFO", &lastlump)) != -1)
+	{
+		FScanner sc(lump);
+		sc.SetCMode(true);
+
+		while (sc.GetToken())
+		{
+			FString cvarname;
+			char *cvardefault = NULL;
+			ECVarType cvartype = CVAR_Dummy;
+			int cvarflags = CVAR_MODARCHIVE;
+			FBaseCVar *cvar;
+
+			// Check for flag tokens.
+			while (sc.TokenType == TK_Identifier)
+			{
+				if (stricmp(sc.String, "server") == 0)
+				{
+					cvarflags |= CVAR_SERVERINFO;
+				}
+				else if (stricmp(sc.String, "user") == 0)
+				{
+					cvarflags |= CVAR_USERINFO;
+				}
+				else if (stricmp(sc.String, "noarchive") == 0)
+				{
+					cvarflags &= ~CVAR_MODARCHIVE;
+				}
+				else
+				{
+					sc.ScriptError("Unknown cvar attribute '%s'", sc.String);
+				}
+				sc.MustGetAnyToken();
+			}
+			// Do some sanity checks.
+			if ((cvarflags & (CVAR_SERVERINFO|CVAR_USERINFO)) == 0 ||
+				(cvarflags & (CVAR_SERVERINFO|CVAR_USERINFO)) == (CVAR_SERVERINFO|CVAR_USERINFO))
+			{
+				sc.ScriptError("One of 'server' or 'user' must be specified");
+			}
+			// The next token must be the cvar type.
+			if (sc.TokenType == TK_Bool)
+			{
+				cvartype = CVAR_Bool;
+			}
+			else if (sc.TokenType == TK_Int)
+			{
+				cvartype = CVAR_Int;
+			}
+			else if (sc.TokenType == TK_Float)
+			{
+				cvartype = CVAR_Float;
+			}
+			else if (sc.TokenType == TK_Color)
+			{
+				cvartype = CVAR_Color;
+			}
+			else if (sc.TokenType == TK_String)
+			{
+				cvartype = CVAR_String;
+			}
+			else
+			{
+				sc.ScriptError("Bad cvar type '%s'", sc.String);
+			}
+			// The next token must be the cvar name.
+			sc.MustGetToken(TK_Identifier);
+			if (FindCVar(sc.String, NULL) != NULL)
+			{
+				sc.ScriptError("cvar '%s' already exists", sc.String);
+			}
+			cvarname = sc.String;
+			// A default value is optional and signalled by a '=' token.
+			if (sc.CheckToken('='))
+			{
+				switch (cvartype)
+				{
+				case CVAR_Bool:
+					if (!sc.CheckToken(TK_True) && !sc.CheckToken(TK_False))
+					{
+						sc.ScriptError("Expected true or false");
+					}
+					cvardefault = sc.String;
+					break;
+				case CVAR_Int:
+					sc.MustGetNumber();
+					cvardefault = sc.String;
+					break;
+				case CVAR_Float:
+					sc.MustGetFloat();
+					cvardefault = sc.String;
+					break;
+				default:
+					sc.MustGetString();
+					cvardefault = sc.String;
+					break;
+				}
+			}
+			// Now create the cvar.
+			cvar = C_CreateCVar(cvarname, cvartype, cvarflags);
+			if (cvardefault != NULL)
+			{
+				UCVarValue val;
+				val.String = cvardefault;
+				cvar->SetGenericRepDefault(val, CVAR_String);
+			}
+			// To be like C and ACS, require a semicolon after everything.
+			sc.MustGetToken(';');
+			addedcvars = true;
+		}
+	}
+	// Only load mod cvars from the config if we defined some, so we don't
+	// clutter up the cvar space when not playing mods with custom cvars.
+	if (addedcvars)
+	{
+		GameConfig->DoModSetup (gameinfo.ConfigName);
+	}
+}
+
 //==========================================================================
 //
 // D_AddFile
@@ -2164,7 +2294,10 @@ void D_DoomMain (void)
 		allwads.Clear();
 		allwads.ShrinkToFit();
 		SetMapxxFlag();
-		
+
+		// Now that wads are loaded, define mod-specific cvars.
+		ParseCVarInfo();
+
 		// [RH] Initialize localizable strings.
 		GStrings.LoadStrings (false);
 
diff --git a/src/d_netinfo.cpp b/src/d_netinfo.cpp
index 2f4d7c9b9..2f75d8372 100644
--- a/src/d_netinfo.cpp
+++ b/src/d_netinfo.cpp
@@ -92,22 +92,6 @@ enum
 
 const char *GenderNames[3] = { "male", "female", "other" };
 
-static const char *UserInfoStrings[] =
-{
-	"name",
-	"autoaim",
-	"color",
-	"skin",
-	"team",
-	"gender",
-	"neverswitchonpickup",
-	"movebob",
-	"stillbob",
-	"playerclass",
-	"colorset",
-	NULL
-};
-
 // Replace \ with %/ and % with %%
 FString D_EscapeUserInfo (const char *str)
 {
@@ -394,7 +378,7 @@ void D_SetupUserInfo ()
 
 	for (FBaseCVar *cvar = CVars; cvar != NULL; cvar = cvar->GetNext())
 	{
-		if (cvar->GetFlags() & CVAR_USERINFO)
+		if ((cvar->GetFlags() & (CVAR_USERINFO|CVAR_NOSEND)) == CVAR_USERINFO)
 		{
 			FBaseCVar **newcvar;
 			FName cvarname(cvar->GetName());
@@ -432,7 +416,7 @@ void userinfo_t::Reset()
 	// Create userinfo vars for this player, initialized to their defaults.
 	for (FBaseCVar *cvar = CVars; cvar != NULL; cvar = cvar->GetNext())
 	{
-		if (cvar->GetFlags() & CVAR_USERINFO)
+		if ((cvar->GetFlags() & (CVAR_USERINFO|CVAR_NOSEND)) == CVAR_USERINFO)
 		{
 			ECVarType type;
 			FName cvarname(cvar->GetName());
diff --git a/src/gameconfigfile.cpp b/src/gameconfigfile.cpp
index 56a8a2252..ddb331cfa 100644
--- a/src/gameconfigfile.cpp
+++ b/src/gameconfigfile.cpp
@@ -86,6 +86,7 @@ FGameConfigFile::FGameConfigFile ()
 
 	OkayToWrite = false;	// Do not allow saving of the config before DoGameSetup()
 	bMigrating = false;
+	bModSetup = false;
 	pathname = GetConfigPath (true);
 	ChangePathName (pathname);
 	LoadConfigFile (MigrateStub, NULL);
@@ -376,8 +377,8 @@ void FGameConfigFile::DoGameSetup (const char *gamename)
 		SetRavenDefaults (gameinfo.gametype == GAME_Hexen);
 	}
 
-	// The NetServerInfo section will be read when it's determined that
-	// a netgame is being played.
+	// The NetServerInfo section will be read and override anything loaded
+	// here when it's determined that a netgame is being played.
 	strncpy (subsection, "LocalServerInfo", sublen);
 	if (SetSection (section))
 	{
@@ -445,6 +446,24 @@ void FGameConfigFile::DoGameSetup (const char *gamename)
 	OkayToWrite = true;
 }
 
+// Like DoGameSetup(), but for mod-specific cvars.
+// Called after CVARINFO has been parsed.
+void FGameConfigFile::DoModSetup(const char *gamename)
+{
+	mysnprintf(section, countof(section), "%s.Player.Mod", gamename);
+	if (SetSection(section))
+	{
+		ReadCVars(CVAR_MODARCHIVE|CVAR_USERINFO|CVAR_NOSEND);
+	}
+	mysnprintf(section, countof(section), "%s.LocalServerInfo.Mod", gamename);
+	if (SetSection (section))
+	{
+		ReadCVars (CVAR_MODARCHIVE|CVAR_SERVERINFO|CVAR_NOSEND);
+	}
+	// Signal that these sections should be rewritten when saving the config.
+	bModSetup = true;
+}
+
 void FGameConfigFile::ReadNetVars ()
 {
 	strncpy (subsection, "NetServerInfo", sublen);
@@ -452,21 +471,35 @@ void FGameConfigFile::ReadNetVars ()
 	{
 		ReadCVars (0);
 	}
+	if (bModSetup)
+	{
+		mysnprintf(subsection, sublen, "NetServerInfo.Mod");
+		if (SetSection(section))
+		{
+			ReadCVars(CVAR_MODARCHIVE|CVAR_SERVERINFO|CVAR_NOSEND);
+		}
+	}
 }
 
+// Read cvars from a cvar section of the ini. Flags are the flags to give
+// to newly-created cvars that were not already defined.
 void FGameConfigFile::ReadCVars (DWORD flags)
 {
 	const char *key, *value;
 	FBaseCVar *cvar;
 	UCVarValue val;
 
+	if (!(flags & CVAR_MODARCHIVE))
+	{
+		flags |= CVAR_ARCHIVE|CVAR_UNSETTABLE;
+	}
+	flags |= CVAR_AUTO;
 	while (NextInSection (key, value))
 	{
 		cvar = FindCVar (key, NULL);
 		if (cvar == NULL)
 		{
-			cvar = new FStringCVar (key, NULL,
-				CVAR_AUTO|CVAR_UNSETTABLE|CVAR_ARCHIVE|flags);
+			cvar = new FStringCVar (key, NULL, flags);
 		}
 		val.String = const_cast<char *>(value);
 		cvar->SetGenericRep (val, CVAR_String);
@@ -485,18 +518,35 @@ void FGameConfigFile::ArchiveGameData (const char *gamename)
 	ClearCurrentSection ();
 	C_ArchiveCVars (this, CVAR_ARCHIVE|CVAR_USERINFO);
 
+	if (bModSetup)
+	{
+		strncpy (subsection + 6, ".Mod", sublen - 6);
+		SetSection (section, true);
+		ClearCurrentSection ();
+		C_ArchiveCVars (this, CVAR_MODARCHIVE|CVAR_AUTO|CVAR_USERINFO);
+	}
+
 	strncpy (subsection, "ConsoleVariables", sublen);
 	SetSection (section, true);
 	ClearCurrentSection ();
 	C_ArchiveCVars (this, CVAR_ARCHIVE);
 
-	strncpy (subsection, netgame ? "NetServerInfo" : "LocalServerInfo", sublen);
+	// Do not overwrite the serverinfo section if playing a netgame, and
+	// this machine was not the initial host.
 	if (!netgame || consoleplayer == 0)
-	{ // Do not overwrite this section if playing a netgame, and
-	  // this machine was not the initial host.
+	{
+		strncpy (subsection, netgame ? "NetServerInfo" : "LocalServerInfo", sublen);
 		SetSection (section, true);
 		ClearCurrentSection ();
 		C_ArchiveCVars (this, CVAR_ARCHIVE|CVAR_SERVERINFO);
+
+		if (bModSetup)
+		{
+			strncpy (subsection, netgame ? "NetServerInfo.Mod" : "LocalServerInfo.Mod", sublen);
+			SetSection (section, true);
+			ClearCurrentSection ();
+			C_ArchiveCVars (this, CVAR_MODARCHIVE|CVAR_AUTO|CVAR_SERVERINFO);
+		}
 	}
 
 	strncpy (subsection, "UnknownConsoleVariables", sublen);
diff --git a/src/gameconfigfile.h b/src/gameconfigfile.h
index 440d900da..74376b583 100644
--- a/src/gameconfigfile.h
+++ b/src/gameconfigfile.h
@@ -47,6 +47,7 @@ public:
 
 	void DoGlobalSetup ();
 	void DoGameSetup (const char *gamename);
+	void DoModSetup (const char *gamename);
 	void ArchiveGlobalData ();
 	void ArchiveGameData (const char *gamename);
 	void AddAutoexec (DArgs *list, const char *gamename);
@@ -65,6 +66,7 @@ private:
 	void ReadCVars (DWORD flags);
 
 	bool bMigrating;
+	bool bModSetup;
 
 	char section[64];
 	char *subsection;
diff --git a/src/menu/menu.cpp b/src/menu/menu.cpp
index 4b4b0c5e8..dc1b8ccd8 100644
--- a/src/menu/menu.cpp
+++ b/src/menu/menu.cpp
@@ -957,5 +957,6 @@ CCMD(reset2saved)
 {
 	GameConfig->DoGlobalSetup ();
 	GameConfig->DoGameSetup (gameinfo.ConfigName);
+	GameConfig->DoModSetup (gameinfo.ConfigName);
 	R_SetViewSize (screenblocks);
 }
diff --git a/src/p_acs.cpp b/src/p_acs.cpp
index 2696863e1..a8469f46a 100644
--- a/src/p_acs.cpp
+++ b/src/p_acs.cpp
@@ -6885,7 +6885,8 @@ scriptwait:
 		case PCD_GETCVAR:
 			{
 				FBaseCVar *cvar = FindCVar (FBehavior::StaticLookupString (STACK(1)), NULL);
-				if (cvar == NULL)
+				// Either the cvar doesn't exist, or it's for a mod that isn't loaded, so return 0.
+				if (cvar == NULL || (cvar->GetFlags() & CVAR_NOSEND))
 				{
 					STACK(1) = 0;
 				}