This is gonna be my go-to system for my next zombie apocalypse game. Very cool.
Yep, I have run a zombie game with it - if you remind players that they don't need to kill each zombie, they will do fine ;)
My "house rule" was that when facing agaist zombies, as long as you beat the DS you are safe for time being from it (it is pushed away or otherwise hindered, giving you time to move away from it). You don't need to get its DS all the way down to 0, unless you want to actually kill it. It worked well for my game, with players mostly running from zombies, instead of mowing them down.