At this stage I just want the 1 sec weave window Malefic has to be standard on all 3 healers. It makes gameplay so much smoother and it's about time they stopped using clunkiness as a balancing factor. Going back to WhM after playing AST for a bit feels like picking up a broken class. You realize Glare doesn't weave and your next window is 18 sec away and it's depressing.
It makes high end ScH/WhM depressing too, because the most optimal way to play is spam Glare/Broil and let the AST heal because AST doesn't lose dps, has ample toolkit and their GcD's are worth less potency. If I want to provide the best for my raid/static, I shouldn't be trying to use my toolkit too much.

Definitely another dps ability. Another DoT like fluid Aura or Aero is a good candidate. Giving us a weave window could also allow something like a 2 charge oGcD instant dps ability that procs off Dia ticks or such (Glare would need a small nerf to balance).
Also there needs to be more damage going out in endgame. There's just too little to heal. It's more the frequency of damage that is the issue, Savage often has gaps of 60 sec or more where you barely need a heal, so we don't get enough chance to exercise those toolkits.

Apart from that I actually like WhM and don't feel it needs to be entirely redone.