I would love to have an KOTH-type arena with killshooter on and the same map as the one currently used for King of the Hill.  Or maybe one with a few more bases.   All planes enabled and a 6K cloud layer.
No CMs needed, first come, first served, and maybe an arena message about respecting fights and not jumping into an ongoing event.  I envision it as a place where squads could go and have their own King of the Hill type fights, or like minded peeps could get together for a change from the MA.
Yes it would have to be self-policed, but I don't think it'd be a huge problem.  Killshooter would be on after all.  My squad has been doing a good bit of squad dueling in the DA side fields and hasn't had any problems with interlopers so i don't think there'd be too much griefing.