I think a good replacement for a crowbar could be.. like a piece of wood to hit things with? From like... a fence or something?
We should have the player only being able to use 1 melee weapon at a time, make it droppable, and have all other potential melee weapons pickupable. That way the player must way up the pros and cons of each melee weapon, and get the one he/she likes best.
I must say that I feel this mod MUST have a shotgun. Perhaps we could find a little abandoned shack somewhere with a dead guy (Father Grigory perhaps?) on the floor, and a shotgun. There is nothing better than using a shotgun against zombehz. ;o
Also, if we have a chainsaw, is it possible to make each limb chop-offable (like in Monty Python's the Holy Grail with the black night ;D)? It'd be damn cool, and would make it so much harder to kill.
Just my current ideas...