Dynamic Queue Role Selection
Personally my queue times after joining Dynamic Queue have been really short (5sec), but about 70% of the time I don't get my primary role. I'd much rather wait 2 minutes and get my primary role more often. While I know there's others who don't really care so much and just get into game quickly, especially for those with really long queue times. So I think there should be a slider to show how important getting your primary role is to you. If you really really want your primary role, then the system will just wait around till it can fit you into a game as that (the original idea of having 2 roles to cut down on queue times wouldn't apply to people who are willing to wait).
This seems like a win-win solution for everyone