This game already needs no skill. Just sit up on a box where you are no longer EXACLTY in line with a zombie's hands. It wont attack you...

However, that will not make you safe from player zombies, and there are very few places that are both safe from AI and player zombie and has ammo nearby

And that is also assuming you are not going to complete the objectives

Objectives list:

Kill Fred... Hop up on a car or something and shoot him in the head a million times until he dies.

Get briefcase... sit on a box near the case, kill the nearby zombies, drop a weapon, grab the case, and run. If you need to, jump up on top of a zombie and walk over all their heads to get clear (works great when case is in the alley on heavensgate)

Defend barricades/kill zombies/secure area... get up on top of a box and shoot

Go to rescue area (which nobody does because it deprives you of skill)... get up on a box near the rescue point and wait for the chopper. In bb_carnage, just grab dual glock18's, flamethrower, and minigun and blast your way thru.

The point: the game is not that hard unless one uses unrealistically high difficulty. If people are smart they can avoid getting killed thru the whole level, therefore no player zombies.