well honestly I only see red mage being a dps( I can handle it if it is a healer but if its a tank No just NO) I can see it having a slow natural MP regen so when the mp is gone, it switches to physical attacks and if the healers of a raid or a dungeon is having a tough time, the red mage would switch to healing and help with healing a party since in my opinion healing comes before dps( talking to all those healers who get DPS tunnel and forgets they have to heal a tank)