[Building Sakai] Instructor should not be able to 'Add Participants' but can manage participant status

[Nicola Monat-Jacobs]

I'm wondering if anyone has encountered the following need:

Instructors should be able to manage participant status (e.g., 'Active' and 'Inactive') but should not be able to add/remove users from the site or change their roles.

Currently, it looks like changing a user's status in a course is controlled by site.upd.site.mbrshp, which also give you access to the undesirable features too.

Has anyone else encountered this use case or done any work in this regard? 

Thanks!

Nicola Monat-Jacobs
The Longsight Group