Index: src/game/g_local.h
===================================================================
--- src/game/g_local.h	(revision 2065)
+++ src/game/g_local.h	(working copy)
@@ -655,6 +655,8 @@ typedef struct
   char              layout[ MAX_QPATH ];
 
   team_t            surrenderTeam;
+  int               lastTeamUnbalancedTime;
+  int               numTeamWarnings;
 
   voice_t           *voices;
 
@@ -1118,6 +1120,7 @@ extern  vmCvar_t  g_alienCredits;
 extern  vmCvar_t  g_alienMaxStage;
 extern  vmCvar_t  g_alienStage2Threshold;
 extern  vmCvar_t  g_alienStage3Threshold;
+extern  vmCvar_t  g_teamImbalanceWarnings;
 extern  vmCvar_t  g_freeFundPeriod;
 
 extern  vmCvar_t  g_unlagged;
Index: src/game/g_main.c
===================================================================
--- src/game/g_main.c	(revision 2065)
+++ src/game/g_main.c	(working copy)
@@ -91,6 +91,7 @@ vmCvar_t  g_alienCredits;
 vmCvar_t  g_alienMaxStage;
 vmCvar_t  g_alienStage2Threshold;
 vmCvar_t  g_alienStage3Threshold;
+vmCvar_t  g_teamImbalanceWarnings;
 vmCvar_t  g_freeFundPeriod;
 
 vmCvar_t  g_unlagged;
Index: src/game/g_team.c
===================================================================
--- src/game/g_team.c	(revision 2065)
+++ src/game/g_team.c	(working copy)
@@ -434,4 +434,31 @@ void CheckTeamStatus( void )
         TeamplayInfoMessage( ent );
     }
   }
+
+  // Warn on unbalanced teams
+  if( g_teamImbalanceWarnings.integer && !level.intermissiontime && 
+      ( level.time - level.lastTeamUnbalancedTime >
+        ( g_teamImbalanceWarnings.integer * 1000 ) ) && 
+      level.numTeamWarnings < 3 )
+  {
+    level.lastTeamUnbalancedTime = level.time;
+    if( level.numAlienSpawns > 0 && 
+        level.numHumanClients - level.numAlienClients > 2 )
+    {
+      trap_SendServerCommand( -1, "print \"Teams are unbalanced. "
+                                  "Humans have more players.\n\"");
+      level.numTeamWarnings++;
+    }
+    else if( level.numHumanSpawns > 0 && 
+             level.numAlienClients - level.numHumanClients > 2 )
+    {
+      trap_SendServerCommand ( -1, "print \"Teams are unbalanced. "
+                                   "Aliens have more players.\n\"");
+      level.numTeamWarnings++;
+    }
+    else
+    {
+      level.numTeamWarnings = 0;
+    }
+  }
 }