Hi Dominique
Did you find an answer to this?
I have been looking for the same thing. On some of our studies our students are on/off for longer periods, but they need access to all courses when passing the final exam.
Our ldap solution must delete group membership when the the user disappear, which means that we cannot provide this mandatory service, without cumbersome manual enrolment from the course interface.
Best Regards
Chester Folming