It's been awhile, but here's my verdict on the add-on thus far:
This is not a matter of fixing things, this is a matter of rewriting huge blocks of messy code, and I just don't want to do that.
Latest Revision:
http://www.mediafire.com/?ugs4fz8mfq1l6dzI'm sorry to say, but I'm pretty much done here. In it's current state, it works
okay, and I use this term very loosely. It's playable. But buggy. I might make a new topic in this section and release it. It doesn't belong in the Add-Ons section, as it's not finished.
I might (don't get your loving hopes up) make my own Zombie Mod, akin to this one.