I more have conceptual wishes. I'd love for a spellcasting tank. Actual cast-bars not just all-instants, too! Ideally use a Sword+Staff, Gandalf style, which can be used as an excuse to:

1. Allow someone else to use Paladin 1H Swords, although this job equips them in the offhand.
2. Revive 1H staff + Shield for White Mage, this job would use the 1H staff as their mainhand.

Another one I'd like is a pure-DoT caster. ~5-6 DoTs to keep up, and the filler is a 5s channeled ability that ticks 1/sec and "eats" 3s of each DoT's duration, causing the damage of that "tick" instantly. So you apply lots of medium~long duration DoTs, and then accelerate them for damage whenever you can stand still (as the ability is channeled), which gives you freedom of movement for 3-4 GCDs right after as you reapply/refresh DoTs.

And another one is a melee job that for their burst has to go ranged (so an inverse Red Mage kinda), they can't do their burst from melee. Or say they can but their skills scale up in potency with distance, a bit like some skills in PvP do.