I hosted... Or at least tried to.
1. Couldn't seem to get a dedicated server working.
2. Creep wouldn't kill or be killed (Yes, players were the creepgame playertype and armed with creepkill)
3. Had problems restricting the access of the creep (Crawling down side, into areas where the players couldn't reach)
I can't do the jump-jet playertype, as you suggested, as Creepgame Mode is the playertype that must be used to get it to work.
I've made a help topic for the dedicated, and a post on the creeper topic. Hopefully I'll be able to give it another shot soon. Sorry that I wasn't able to get it up tonight.