Honestly, I just wish that there was a way to branch off each class like ACN does with SCH/SMN.

Something like:
Marauder to Warrior(Tank), Berserker(DPS).
Gladiator to Paladin(Tank), Holy Knight(DPS).
Conjurer to White Mage(Heal), Geomancer(DPS)
Thaumaturge to Black Mage(DPS) Time Mage(Support DPS)
Lancer to Dragoon(DPS), Valkyrie(Tank)
Archer to Bard(Support DPS), Ranger(DPS)
Pugilist to Monk(DPS), Master(DPS)
Rogue to Ninja(DPS), Assassin(DPS)