Hi wisecrack,
just read thorugh your rules. They seem straight forward enough for a fun game. There is a mix of inches and centimetres in the movement section though. Also wouldn't "spare limbs" be better used as clubs?
How about a zombie bite? A hero victim needs a saving throw and on a fail turns into a zombie and is lost. Civilians bitten don't get a saving throw (an idea for a scenario perhaps?).
All in all, I like your ideas and I agree with the use of Hasslefree figures.
Cheers