Personally I think its an aweful idea, great way to kill any adventure withijn the map. Its akin to using "cheat codes" in a game, once you do it the rest is spoiled.
Are you guys serious? So you want to sort of cheat just to kill lots of zombies in a cheap way lol. That's not real gaming that's just cheap. I would rather spend all my time playing with randoms on zombies than to ever have these options that would ruin the game. Difficulty and survival is what made zombies so stop crying because you can't make it to 30 or 40+ and just play the da** game.