Also, I had a neat idea to prevent zombies sticking on things, And tricks for zombies..
- Using 'trigger_monsterjump' to get zombies to 'LUNGE' at you from different spots. Say, Out of a closet or dark hallway. Combined with a trigger_once or trigger_multiple and a zombie spawnpoint, This could be fun.
- Instead of putting zombie player spawns where zombies typically start, Make a 'ready room' of sorts with teleports to take the zombies where they'd be most needed to harass the players, As seen in some good CS or HL maps.
- Use monster clip bruses at the edges/walls of rooms that players can pass through, But that will keep zombies from getting stuck on walls when following the player, Or around doors to prevent bottlenecking.