1. No, that's what made the original zombie mod take 15+ seconds to execute.
2. Yes, for the most part, although Boomers sometimes stay standing when dead. The corpses absolutely can't hurt you now, though.
Earlier I took a shot at scripting the control-zombies-when-a-zombie-kills-you thing (which, of course, can be toggled with the GUI). On the first try it worked. I hadn't tried it before because I thought it'd be too hard... Well then. The player-controlled-zombies will spawn where normal players do, though, I'll see about that. Another thing I need to do is the players can't respawn so they turn into camera objects thing, but I can just look at Cops'n'Robbers' coding if I can't figure that out.