Hi GailyD ,
Thank you very much for your post.
Front end manager has already been placed on the list of future features. We don to think of bringing it in until 2020 I am afraid. There is only few of our members that requested it so we are concentrating on features wanted the most.
Regarding user restriction, you can edit user access by any user role editor. ATUM should work just fine, however, the user will go back end and you would need to restrict everything you do not want them to see. Should be possible with User Role Editor plugin.
Hope this helps.