I'm messing around with Grid + GridCustomLayouts + Clique for PvP's.
My Pally is dual spec, to a Prot/Holy second spec.

With GridCustomLayouts, I can have each member of my team visible as a bar, irregardless of the group they're in.

I use Target=TargetTarget for my assist system, so the shammies nuke whatever the pally targets.
I don't want the pally to have to change targets for healing.
My PvE heals are all assisting the pally, or directed to the pally and work really well.

Clique (with Grid) basically duplicates the effects of HealBot.
I've gone with Alt-Left Click and Alt-Right Click, target = mouseover (which is the Grid bar).

Working so far.
As long as you're on the healer toon, or have reliable mouse broadcasting, it should be fine for you too.