For me, RDM should be the NIN of the casters. Full of utilities, buffs, CCs and so on just to represent better its 'white' side.

About ress, Phoenix Down should be able to be used inside combat, with a 10 seconds cast time and stockpiled at 999. And all those skills that used TP should take its toll on MP, not just some tanks (DRK, PLD), casters and healers.