Forgot to do this.

src/lua_maplib.c

@@ -2080,6 +2080,8 @@ static int mapheaderinfo_get(lua_State *L)
 		lua_pushinteger(L, header->levelflags);
 	else if (fastcmp(field,"menuflags"))
 		lua_pushinteger(L, header->menuflags);
+	else if (fastcmp(field,"startrings"))
+		lua_pushinteger(L, header->startrings);
 	// TODO add support for reading numGradedMares and grades
 	else {
 		// Read custom vars now

src/p_setup.c

@@ -209,6 +209,7 @@ static void P_ClearSingleMapHeaderInfo(INT16 i)
 	mapheaderinfo[num]->actnum = 0;
 	mapheaderinfo[num]->typeoflevel = 0;
 	mapheaderinfo[num]->nextlevel = (INT16)(i + 1);
+	mapheaderinfo[num]->startrings = 0;
 	snprintf(mapheaderinfo[num]->musname, 7, "%sM", G_BuildMapName(i));
 	mapheaderinfo[num]->musname[6] = 0;
 	mapheaderinfo[num]->mustrack = 0;