I like that idea, I don't know if you'll like this idea, but one thing I would like are food stashes. I'm not sure if you like this idea, I'm taking some ideas from Dead Island. I would definitely love to see people role playing as police, and firemen and mechanics and such, stuck and having to work together with their skills. I can already see this as a great gamemode.
I'll add food stash as a container type (never played dead island).
Edited:
You should take out paragraphs of the Max Brooks'es zombie survival guide
I'd rather have any zombie guides as more handwritten stuff and general survivalist guides as books - more realistic that way.