The players on the "mob" team would get no control of skill bar choice, no control of attributes or weapons (except weapon set switching if the PvE monster has weaponsets) - their set up would be exactly the same as the PvE monster found in the "wild." The "mob" team should include one boss, and should probably be limited to six players where the human team can have eight for balance (this would have to be monkeyed with, possibly - is being limited to 4 skills and having no control over what they are or your attributes enough balance vs the higher attributes?)
To avoid fighting over who gets to be the boss, the arena should work like Random Arena for assigning the Mob team, players would just hit "Enter Battle As The Mob", the system would gather six (or eight, depending on balance issues) people, choose a random mob and assign the players randomly to play one of the monsters, then match them in the arena with a "regular" team that was formed the normal way (ie, gather team of eight, leader pushes Enter Mission button.)
I think this would be a heckuva lot of fun, either to play as the Mob controlling a monster character with high attributes (if limited skills) or as the regular team, going up against a mob that reacts intelligently rather than the game AI.
I think Lord Balthazar would be pleased, don't you?
