Would it be possible to appoint a team of admin so that if a party leader goes offline - not unreasonable in marathon parties *coughs Toxic Moon* - then the ability to control the party is passed on in some way?
I like this idea as a host can't always stay for the duration of the party and if someone decides not to play nice the party goers have no way to remove them. perhaps a baton pass system where the host can nominate another to have the control would work.