I honestly think RDM should be melee dps/support.

I'm talking support in the same sense brd & mch is except instead of recovering mana and stamina you recovery hp and sta. You could go into a caster stance to cast heals or apply long laster (but low potency) dots and a melee stance to go in with a rapier.

Really though I don't see how a RDM could work in this game. Thats the best I can come up with.