You could also contain all of your heals inside one macro using modifiers. I do this with my Warrior/Paladin combo:

#show Holy Light
/cast [modifier:alt, target=player] Holy Light; [modifier:ctrl, target=SecondCharacter] Holy Light; [target=MainCharacter] Holy Light

Broadcast this keystroke to all machines.
Alt+key will heal yourself.
Ctrl+key will heal a secondary character.
The key by itself will heal the main.

Replace SecondCharacter and MainCharacter with your character's names, and Holy Light with Flash Heal, Greater Heal, etc.
[target=player] means yourself.