Thank you for your prompt replies to my question this morning. There is a reason why three of my users have a manager role system-wide, but I expect that I will have to persuade them to avail themselves of two different hats, one a admin, one as teacher.
As for the export of courses containing questions outside their own context: Not feasible!
I did create a role like question-sharer, which works very well and is right in line with the ideology of social constructivism. But if you start creating quizzes that rely on question banks outside the course context, or even outside your own department, that spells trouble should you wish to export that course.