Is this link still alive?

I am all for students creating groups but they shouldn't be private unless the group is managed by a teacher.  Thus, the student would go to the teacher with the group idea and the teacher could create it with themselves at the helm.  That sounds tough to program so you could make the plugin that makes admins the only one who can create groups - then at the request of the teacher, create the student group and make it private if the teacher wants it.