Actually, there is no possibility to share all admin rights for a campaign : even if you give GM rights to another player, he can't duplicate the campaign. If you share the administration of a campaign with somebody else, it's very annoying. My own exemple : i have a campaign to play an online version of a boardgame. We duplicate the campaign for each new game session. But only the single admin can do this. So if my co-admin want to play a new game without me, he can't if i didn't duplicate the campaign for it before. I guess there are some mentor rights issues here (if one has mentor status and the other not), but it would be very useful to find a way to do it. For exemple, at least giving a player the option to give the admin rights of a campaign he owns to another player.
