Fencer into Red Mage, ala Tactics, would make a nice transition into this game. I'd like to see them as a relatively weak class, with plenty of support options, but unlike other casters, have an auto attack that is worth a damn. I think a short GCD (1.5sec) would make a good substitution for dual cast especially if it was an active buff that lowered your GCD.

I think red mages could easily have a "enfire" type ability as well. Or they could just go FF13 style and give them Flamestrike, Froststrike; ect. It'd also be cool if every basic magic skill was cross classable even if its nothing more then for flavor (Blizzard, Fire (no Astral/umbral effect), Cure, Thunder, Aero, Stone)

Honestly i don't care how they implement red mage, i just want to play one.