For IS Boxer, I'd enable Send Next Click, with an Action Target Group as the target.
Check KVM, so the current window does not receive the mouse click.

Then put all of your Shammies in the AoE action target group.

I actually have AoE's on three different keys, across my assorted teams.
So those keys, send next click to the appropriate ATG (AoE_4, AoE_5, or AoE_ShA).
If I want a given toon to AoE on "5", I add them to the Action Target Group, AoE_5.
My Druids are members of this group when in Boomkin spec (Hurricane), but not when in Feral spec.
Plus this way, you can mix/match characters, and have ground target AoE's work properly.



You don't actually need to take the 31 point ability, to unlock the next talent tree.
But is there a 31st point ability in the Primary Talent Tree, that is better then the bottom ability?

Ghost Wolf is available early enough in Enhancement, it will be an option by level 82 for an Elemental/Resto shammy.