User Registration Groups

This has proven to be more difficult than I thought. It would be fairly simple to group your registered users according to how you group your Zones in Zone Control. But what if you want to administer or create groups of Zones that would allow seperate roaming from within one login? Eventually someone will say - "I setup two different locations, but I don't want end users to roam..." or "Coffee shop A has three locations, and Coffee Shop B has one location. I don't want users to roam between the different coffee shops" or "Is there a way to allow any Public IP registered end-user to roam to my location."

You see my concern....