The only change I'd like to healer AOEs is for

Kardia to scale with SGE's hit. If it makes SGE as powerful as WAR in AoE healing... I don't think many are gonna complain when that's, y'know a HEALER's job and you can always adjust the potency. *cough cough nerf war's cough*

SCH to get back bane to spread its DoT for AOE and maybe Miasma as well to do the same.

AST... Can a Fortuneteller get a detonate to speed up to explode something? Or... can I get a way to swap Lady for Lord?

I don't really care that WHM has a stun and the other healers don't. I'd rather WHM keep their stun and give other healers something else to make their AOE abilities interesting.