I was thinking of this the other night after being frustrated that as a DPS the waiting time in DF is so long, whereas I can insta-que as tank or healer. Duh right? Well consider this...

Would it not even the playing field if you could have Class Roulette implemented? It could work like so...

1- Any classes you select to use in the DF can be used at random when matching players for dungeons.

2- When selecting an available class to play as, you also select a class that you wish for the XP to be given to.

This way it could help even the distribution of classes available to the DF and also allow you to gain XP on whatever classes you are in the process of levelling.

The only thing that this hinders is actually getting to play as the job you are levelling, but given the circumstances and the way this game is played. It SHOULDN'T be an issue.