The other idea I had on this was to have my healers have buttons 1-5 be something like.

1 = /target char1
/castseqeunce reset=target HoT, Cure

2 = char 2 and so on

Then basically what would happen is in a boss mob fight while I am focused on my tank if I see the other toons life dropping I can hit 1-5, 1-5 for the tank will be single target aggro, and hit the apprioate character with 3 HoTs then hit the same button a second time and it will attempt to clear any Dis, Pos, and or Curse.

The main idea here is I want to keep my support toons alive during boss mob heroics. Something I had a problem with when my crew just had a priest in it.