diff --git a/inc/shared/game.h b/inc/shared/game.h
index e5f69700a..8c5fd4d76 100644
--- a/inc/shared/game.h
+++ b/inc/shared/game.h
@@ -44,15 +44,18 @@ typedef enum {
 
 // extended features
 
-#define GMF_CLIENTNUM               0x00000001
-#define GMF_PROPERINUSE             0x00000002
-#define GMF_MVDSPEC                 0x00000004
-#define GMF_WANT_ALL_DISCONNECTS    0x00000008
-
-#define GMF_ENHANCED_SAVEGAMES      0x00000400
-#define GMF_VARIABLE_FPS            0x00000800
-#define GMF_EXTRA_USERINFO          0x00001000
-#define GMF_IPV6_ADDRESS_AWARE      0x00002000
+// R1Q2 and Q2PRO specific
+#define GMF_CLIENTNUM               0x00000001  // game sets clientNum gclient_s field
+#define GMF_PROPERINUSE             0x00000002  // game maintains edict_s inuse field properly
+#define GMF_MVDSPEC                 0x00000004  // game is dummy MVD client aware
+#define GMF_WANT_ALL_DISCONNECTS    0x00000008  // game wants ClientDisconnect() for non-spawned clients
+
+// Q2PRO specific
+#define GMF_ENHANCED_SAVEGAMES      0x00000400  // game supports safe/portable savegames
+#define GMF_VARIABLE_FPS            0x00000800  // game supports variable server FPS
+#define GMF_EXTRA_USERINFO          0x00001000  // game wants extra userinfo after normal userinfo
+#define GMF_IPV6_ADDRESS_AWARE      0x00002000  // game supports IPv6 addresses
+#define GMF_ALLOW_INDEX_OVERFLOW    0x00004000  // game wants PF_FindIndex() to return 0 on overflow
 
 //===============================================================
 
@@ -69,9 +72,12 @@ struct gclient_s {
     player_state_t  ps;     // communicated by server to clients
     int             ping;
 
+    // set to (client POV entity number) - 1 by game,
+    // only valid if g_features has GMF_CLIENTNUM bit
+    int             clientNum;
+
     // the game dll can add anything it wants after
     // this point in the structure
-    int             clientNum;
 };
 
 
diff --git a/src/server/game.c b/src/server/game.c
index 50ccd6037..60a846884 100644
--- a/src/server/game.c
+++ b/src/server/game.c
@@ -49,6 +49,10 @@ static int PF_FindIndex(const char *name, int start, int max, const char *func)
     }
 
     if (i == max) {
+        if (g_features->integer & GMF_ALLOW_INDEX_OVERFLOW) {
+            Com_DPrintf("%s(%s): overflow\n", func, name);
+            return 0;
+        }
         Com_Error(ERR_DROP, "%s(%s): overflow", func, name);
     }
 
@@ -113,7 +117,7 @@ static void PF_Unicast(edict_t *ent, qboolean reliable)
         flags |= MSG_RELIABLE;
     }
 
-    if (cmd == svc_layout || (cmd == svc_configstring && msg_write.data[1] == CS_STATUSBAR)) {
+    if (cmd == svc_layout || (cmd == svc_configstring && RL16(&msg_write.data[1]) == CS_STATUSBAR)) {
         flags |= MSG_COMPRESS_AUTO;
     }
 
diff --git a/src/server/server.h b/src/server/server.h
index 7572901a8..19477923e 100644
--- a/src/server/server.h
+++ b/src/server/server.h
@@ -89,7 +89,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #define SV_FEATURES (GMF_CLIENTNUM | GMF_PROPERINUSE | GMF_MVDSPEC | \
                      GMF_WANT_ALL_DISCONNECTS | GMF_ENHANCED_SAVEGAMES | \
                      SV_GMF_VARIABLE_FPS | GMF_EXTRA_USERINFO | \
-                     GMF_IPV6_ADDRESS_AWARE)
+                     GMF_IPV6_ADDRESS_AWARE | GMF_ALLOW_INDEX_OVERFLOW)
 
 // ugly hack for SV_Shutdown
 #define MVD_SPAWN_DISABLED  0