Thanks for your responses Kevin and Kathy. In general, the requirements are that the users are able to see who was e-mailed on the alarm and anyone can “reply all” to the e-mail to figure out who is responding.
I’m wondering if I used system.roster.getRosters to pull users from “RosterA” (if you can pull the contact info out of them), then create the “Meta-user” with contact info from the Rosters with system.user and put the “Meta-user” in “RosterAprime” (a meta-roster) that would be used for the actual notification.
I’m hoping that a simple way to do this could be added to Ignition in the future. It seems like a really handy feature.