I have three keys, for AoE.

These keys, Send Next Click, for an Action Target Group.
Then I create three Action Target Groups.

Something like:
- AoE_4
- AoE_5
- Aoe_ShA

Then just add members of a given team (that I want to AoE on a given key) to that group.

So for example, my Boomkin Druids are members of two groups.
Hurricane and Treants.

Shift A, on this team is Starfall, which does not require targeting.
So they're not a member of the AoE_ShA group.