just thinking out loud really
situation: you're in a group.
when someone picks up a quest, it automatically gets shared with the rest of the group (like in trials) - do you want to accept.
the group leaders quest is the one that is active (by default)
you can change it, if you're doing something else. and then when the group leaders changes again, it says 'the group leader is now on XX quest, would you like the same?'
i'm sure there are details to consider, but i would find this most helpful with the group questing that i'm doing.
perhaps there is an addon?
and perhaps there should be an option to turn it on and off