Allow players to queue for multiple duties at the same time

[Krotoan]

And that in itself would cause problems quite likely with reserving a spot while they are already bound by a duty. Most likely doing something like that would hinder other people from getting into a duty in a timely manner, and essentially cause the person queueing like that to end up jumping the line of people who have been waiting for a duty to pop

Yup. Those are the inherent problems if you just stack that ontop of what we have now.