I'm curious on this too. I figured out there's a way to COMBINE two groups under one shortcode. We have medical staff operating in multiple locations so so for instance, our Clinic Staff in Atlanta VS Clinic Staff in Alabama. Doing that classification for all the other departments and locations we have would be an utter pain to make new groups for every combination.
how it works now: [simple-staff-list group="Coach, BaseBall"] will list users from both groups
But I want to say "only show Staff members that apply to all groups listed groups" - not "only show Staff members that apply to any group listed"
Hope this makes sense? Not sure if something exists in the code and i'm just missing it. I stumbled uppon the "," example. Either way that "," feature should be explained in the Usage page