I think most people would be happy with a DPS RDM with strong healing support. Utilizing TP and MP respectively. Being able to rezz and restore hit points when the pressure gets heavy on the main healer much like the ACN class minus pet. That's probably the simplest approach to the job. I think it gets tricky when it comes to balancing casting/melee versions of their DPS.

Personally, I like the idea of them being able to wear leather armor, and use rapiers and bucklers, and with this kind of set up I suppose it only makes sense that I would happiest with a DPS RDM, even though I want to heal with this job. I just don't want it to be a tank.