Time Mage is a job I always wanted in the game. I really don't care about any other job being added. I know RDM has most of its abilities like slow and haste and gravity, but I'm sure SE can add stuff to Time Mage to make it a little more extra. Of course give time mage their slow and haste but make it more potent than any other job perhaps. Give them some sort of random clock ability and that when the clock strikes a certain hour randomly then the Time Mage can either do some form of ability or has their power adjusted?
Also, the time of the vanaday, the phase of the moon, the month of the vanayear, maybe this can all have some sort of effect on the Time Mage as well to give them extra boosts to certain things and weaken certain things. If anyone has ever played FFIV: After years then maybe they'll know what I'm talking about with the moon phases. Certain moon phases can strengthen attack while weakening black or white magic. Maybe do something similar to that only a buff that gives AoE as a boost for these certain things to make Time Mage a support job. I think it'd be quite cool if SE placed this job in the game.