Personally I use clique and hotkeynet to send mouse clicks to my healers window. Using this I can just shift + left/right/middle mouse click anyone in party and have healer holy/flash/cleanse.

Seems to work really well but you will need to setup party list in same order and exact same placement on both windows.

As for other skills all my healers skills are on shift + 0-9 and normal tank skills on 0-9 and a few other keybinds.