Hey there Art, I just wanted to let you know this is something we're looking into internally. I believe this may already work, and in this case though you'd leverage OAuth to authenticate with the account directly, rather than authenticating under the admin/primary account. I'd like to get some testing set up on this though to confirm, so I may reach out on a ticket if I have any questions along the way. Thanks Art!
Kyle Kerst
IT Coordinator
SmarterTools Inc.
www.smartertools.com