@mikedev @silverpill actually, Smithereen has private (invite-only) and closed (manual approval + invites) groups, and I do have an authentication/permission mechanism to go on top of FEP-400e, what I called "actor tokens". I have it documented here: https://github.com/grishka/Smithereen/blob/master/FEDERATION.md#access-control-in-non-public-groups
Never made it a FEP because I thought that the whole FEP process was dead. Should I make one?