I recently tried your plugin. I ended up not using it. Now I have a problem because your plugin added to 'Super Admin' role and I don't want that!
Certain user of my site are allowed to create additional user accounts of which they set the user role. Now they have the ability to create 'Super Admininistrators' and that is NOT what I want.
Could you please fix this, that when uninstalling your plugin, it removes this role, or at least give the possibility to delete it with another plugin. Or tell us how to delete this role when not needed?