Is there a tool (a cutdown, mini ScadaAdmin so-to-say) only for user administration (roles, users and rights to interface administration), so the users/operators can manage users and rights on their own?
Good question. Nope. To make this feature possible, SCADA-Server needs to support command of updating users (rights, etc.) without restart.
I hope in this year we develop a mechanism that allow to workaround this issue and use external module to login and access management.
In the future it should be possible out of the box.