I think you are working too hard on this issue. In my institution, we create courses, enroll teachers and students, and tell the teachers to go to it. I don't think one of my 120+ instructors has ever looked at enrollment issues, clicked on users in course admin, etc.
When there's no need to go into Users, only the Deeply Geeky go there.
So, use a flat file to enroll students. Tell teachers they've got 10 topics. Show them how to add resources, especially now using Davo Smith's jimdandy drag 'n drop. Tell them not to muck about in course administration beyond the grade book.
As they get comfortable with Moodle, they'll start exploring, but for starters just have them teach and give them the teacher role.