Hi,
I think that Debian Academy should host anything related to Debian; not only about developing Debian, but also about how to use Debian. The students that participate in courses about how to use Debian, may also discover that there are also courses about how to develop Debian, and may decide to learn more about it. So I don't see why there should be some restrictions in this regard. I could understand the restrictions if the resources were limited and only a few courses could be supported, but it doesn't seem that this is the case.
Also, in my opinion, live (interactive) courses are better than courses that only contain some resources to be studied by the student himself (which is not much different from documentation). But I don't think that we should be restrictive in the types of courses that are accepted. Any type of course that might be useful to some students should be Ok.
Kind regards,
Dashamir