I had a customized version (it’s probably still kicking around my dev server somewhere), used CommandHelper, WorldGuard, WorldEdit, and a rollback system to pretty much automate that game.

The second version ( http://www.youtube.com/watch?v=rj2GnsdLx6o ) doesn’t seem to have the same lag problem (the walls coming down is done in a way that minimizes lag); that said, I don’t see it coming to FSMC… once you’ve played it a few times it devolves into remembering where everything up and choosing to turtle vs. go full out offensive (and it can really suck when everyone turtles… heck, it sucks even when one person turtles as they can hide for a very long time…)