im not a server maker or a map maker, but wut if there's a zombie infection mod? Just like Counter Strike: Source. There will be 3~5 zimbies wit unthrowable knife (just to make it fair) that has 5X the amount of health of an ordinary player, and 1.5 X faster. While they humans will have 10~15 people wit any type of gun they wish, and ordinary speed, trying to kill the zombies off. If the zombies get you wit the knife, you'll be infected and will be using knife.
Kills-
Zombie infecting Human=1 kill
Human killing Zombie=6~8 kills
I would actually love to play a server that's like this lol