At some point in the future more complex arrangements for sharing radios might become available, but that's just pure speculation on my part.
I would like to see it configured on a spread sheet. The email address and the password. It would all be under the original e-mail address, and password. Using the spread sheet eliminating an entry would obviate that call. Adding an e-mail address and password would enable an additional user. All entries could only be made by the owner of radio. The visiting client would could log on just as the owner logs on now, using the e-mail address and password. There could be check boxes that would allow transmit and audio or audio only.