I've been trying to set it up so that I If hold assist my shamans heal the master's target and if I don't they heal their own target. The reason I'm doing this is I change my key bindings to F1= target party member 2 (leader) f2 = target self etc. Also if this was possible that would mean that in a raid setting I would be able to heal separate targets with all chars. Also If I have all chars healing the same target that's more heals hitting in one second than I really need on one target. I would like to spread out the heals If I can.

For example would It be possible to Have shaman 1+2 heal 1's target and 3+4 heal another target by doing something along the lines of
Alt+healkey for Shaman 1+2 and Shift+healkey for shaman 3+4
So I could target party/raid member X press alt+key then switch targets and press Shift+key rinse repeat. Also I Would be able to set up /stopcast macros similar to this to stop the casting of each individual char or all 4 at once

Any help/tips/ideas?
thanks
Exblah