I'm sorry if this has been suggested before and shot down; I tried searching but found nothing.

I would absolutely LOVE to see the Mathematician Tactics job class adapted for FFXIV.

My vision of this job would have it with the ability to artificially effect levels (i.e. raise lvl +1, +3, +5) in order to adjust the targets you'd like spells applied to and have the same global impact as the tactics version where you could potentially put a beneficial effect on an enemy. I could also see this class being split like Summoner/Scholar in that one is more DPS focused and the other has support/disable abilities like Haste/Slow/Cure/Regen.

Anyways, I think the professionals would be able to flesh it out better than I could; just know that you'd make at least 1 player ecstatic if it ever came to fruition.