Thats a good idea Vassy, its just when i finish this game, i want other people to play it and enjoy it, but i also want people to think it looks good.
Heres what i think might make that a bad idea:
You walk round a corner and a head of you down a dark alley you see a zombie eating a body. But the player hasnt walked through the trigger_once wall yet so the zombies still oblivious to the player presence. Any normal player would just kill it the moment they saw it, so some players might not even be attacked by this zombie because they didnt de-trigger it.
Im not sure i really explained that very good.... :
But that was a really good idea, thanks!