Have you ever read "Zombie Survival Guide" by Max Brooks, IT? Gives plenty of inspiration regarding weapons.

Then again, those weapons are "recommended" for zombie-slaying and you do have most of them already in the mod, but it is a good read (if suffering a bit from an acute case of typoism).
Also, since you have removed clothing, won't this make the survivors freeze in glacier biome's? Maybe you can add something like a survival suit? Covers the body, but just thin enough to keep from freezing and thus not a good idea to protect yourself from getting bitten?
Also, would it be possible to have something like a flamethrower? I'm not sure that you can add "breath" effects to weapons, so this might be a longshot. But it would be FUN. !!FUN!! actually.
As for the tileset: you guys can use the "art" set from other graphic sets. While this won't give you full graphics, it will make the grass look like graphical grass. Just get Ironhand or Phoebus and use their ASCII set. It will make the waiting more bareable and so IT doesn't have to rush the next release.

Mind, just a suggestion!