I like that idea.

The distinction between "all shamans" and "other shamans" would be...
If you are a shaman, "other shamans" is everyone but you.
If you are not a shaman, "other shamans" is all shamans.
And "all shamans" is then every shaman, even yourself in the event that you are a shammy.

So far I've gone with fixed teams.
Four teams, and the same toons on each team always.
This would really make them interchangeable.

I'm contemplating trading a warlock (Red Set) for a shammy (Blue Set), and the mapped keys will need adjustments.
Setting up by action target groups, would make this a lot easier.
At the moment I've got things like GroundTarget, Melee, Shaman, Warlock; could easily expand it to make every set interchangeable.