On my Ramparts and Blood Furnace runs I was having difficulties cancelling heals when they were not needed. Now I'd got it into my head that I could move around a bit to cancel the heal, all very well apart from making me look a little odd, twitching around at the back of the party. However I was using one hand to guide the mouse around to select people, the other hand was pressing the healing buttons so that left no hands free to move around.
#showtooltip Healing Wave(Rank 12)
/cast Healing Wave(Rank 12)
I'll definitely give this a go next time I go healing. On an unrelated note you wouldn't think the infernal above could be frozen would you?