Currently the only way to have new users seems to be to invite them with the link, or have them register. I'd like to see and option to click a button in the UI, set the details and hit "Create".
Likewise, it should be possible to edit user's details, such as name, email, picture etc (currently only the user themselves can do that). For now, admins can only add existing users to groups and change roles.

As there isn't even any API endpoint for that, it should be created first to allow it.