In the link below, there are some assignments for user viewer, publisher and administrator
Can I have one role, for example Viewer with all privileges from disable? In the other words a Viewer that can´t do anything?
With the default Viewer role, you wouldn't be able to edit this role, but, with a custom role you could build a role that has very very limited functionality. I tested a custom role with no options enabled, and it purely appears to be a Viewer type role. It doesn't appear I can create or utilize anything.