It would be nice to have a notification in the duty select screen IF parties are in progress and need your current role.
For me - if I were to check the duty screen and could see there is a low level duty in demand of tank or heals, I'd most likely jump in.
Granted, tanks/heals will snipe the status to get their roulette done asap, but that doesn't have to be a bad thing.

I don't really get the problems involved here with the 3 stike thingy.