We want to only allow 'managers' to self enrol on a course but there is no supervisor flag field in the dropdown self enrolment rule area. All line managers are actually absorb supervisors, i.e. an absorb user account may have them selected as their supervisor. Ideally by default if a user has been selected as a supervisor of another user, a supervisor read only flag should be set in their account. That way we don't need to setup a custom 'isSupervisor' / 'isManager' field or have a job title with 'Manager' in it or setup a new custom managers group.