I would love to see whm gain TP while casting cures and removing status effects. This has precedent in other final fantasy games. It isn't something that would unbalance the game, but would give the opportunity for a whm to run in and throw a weaponskill every now and again without needing to be constantly hitting the mob for TP, which is dangerous on many mobs due to AoEs and most of the time, the whm just doesn't have that much time. It also would give whm a more consistent form of MP regen from weaponskills like Spirit Taker or Moonlight.
It also keeps in line with what SE gave blm, drk, and sch with TP from elemental magic.