It would be cool if zombies hear noises and sounds, so if they hear a weapon fiering or some glass breaking they will walk to that area, and if there are pleyers there, they would attack the players, so you need to be aware of where you shoot, what you shoot with or what you break.
silenced weapons would not attract zombies tho.
setzombeattention would make it so if glass breaks, but not if weapons shoot, i think.
would also be awesome of you talk something, the zombies can hear it, so if they are close enough to where you are and typing something in the chat, they can hear you and find you and eat you.
I have a crazy mind.