Heres my suggestions, borrowing a few ideas from a Hostie server i usually play on:
First please note that, no matter what you do you have to have layed back fun-loving players on this server, otherwise it won't work, period. If you have just 1 CT that holds a grudge against a certain player for knifing him 3 rounds ago this server won't work at all.
I suggest that you add strict rules, and give power to the players.
1.) Amp up the command rules~
-Any CT can give any T a reasonable command(I.E move here, go there, don't come near me, drop the gun, etc)
-A CT can shoot any T that does not follow the reasonable command
-A CT cannot give any T an unreasonable command(I.E type kill in console). If a CT insists that you must follow through with the unreasonable command, you have permission to kill him/her without it counting as rebellion.
-If a CT accidently kills an innocent T in the crossfire, it would be common courtesy(Or in this case a rule) that the CT kill themselve that round or the next.
-Use the 'simon says' feature. First one to type in Simon Says gets Simon.
-Simon MUST have a mic to use this feature
-Simon can give any reasonable command to the Ts and they must follow(Assuming simon said Simon Says at the beginning)
-If simon does not add the Simon Says to the command the T that does that command can be shot.
-The end result of this would hopefully be a CT delivering a set of commands with simon says such as "Jump, crouch, do a 180/360 jump spin, face the wall, etc" and then eventually say something like "Stop" without the simon says, at which point a few Ts would stop, and be shot.
-Eventually when the Ts start droppin' and it gets down to 2-4, you can say something like "Simon Says Crouch War" where the Ts would have to try and crouch jump onto each others heads, the ones who succeed in this live, the ones who get jumped on die.
-Use the Last Request feature
-The last T alive(Assuming they haven't rebelled) can demand a last request
-The T can demand any of these as a last request(Or LR):
Crouch War(As explained before, one who fails has to die)
Jump Shot(A CT takes a position below a ramp/anything you can jump off of, and the T receives a deagle. The T must jump off and fire 1 shot at the CT as they fly through the air. Then, roles switch and the CT will fire 1 shot. Repeat till one of them dies)
Gun Toss(You and the CT takes a position atop a jumpable building, ramp, cage, etc and you must jump off of it and throw your gun into the air. One who throws their gun farthest wins, other dies.)
Take Your Chances(T receives the guns of their choice and the T goes to CT spawn and CTs go to where the T requests, after 20 seconds or when the T is ready the sides have permission to come out and open fire)
Shot By Shot(T and CT of their choice stand accross from each other, and take turns firing 1 shot till the other is dead.)
2.) Give Power To The Players~
-As requested by Gray, the Auto-Mute feature has to go, communication is a MUST on this type of server.
-Add votekick and votemute(I believe voteban is already enabled?)
-Only allow trusted Admin to use ban, and limit the other admins on the server to few kicks a day.
Well, thats what i think about the situation, going from past experience from other Hostie servers. I may be a newb to this forum, but Zombie Murder has been my main server to play on for well over a year now(Literally, for like 5-6 months i only used ZM Escape servers ;P) and i hate to see it crumble under the misunderstanding of a new server.