Hi @RosieHeinsius ,
I am too much of a control freak to delegate the responsibility for course creation, even if my current institution allowed it, I would prefer that the right to create is reserved to admin with some sort of request log in place - this also gives you a degree of control over consistency of titles, codes etc.
If you are prepared to live with the carnage that is user controlled course creation, then there are existing reports at sub account level that can be run to get a course listing, including course storage report, and course activity report. You can filter the latter by role which will then give you the IDs and names of sites that your colleagues are adding.