Indeed, I've been thinking about doing that. As a general policy though, I won't usually add downloads that members provide to that section. While there are many members who I trust, it's safest for our users if the download section is not open to submissions at this moment. Instead, though, I am fully open to suggestions.
As for videos, they would probably be better on a video site. That way users can view the vids in their browser instead of having to manually download and open the files.
I originally intended for the primary use of the download section to be for software that I want to put out there, but midi files are easy to zip up and make available as well. They're not a common request, but when I have the chance I plan to stick more in there. If I do, they'll be grouped as soundtracks (of a sort) like the files already available. Final Fantasy VII is probably next since I did get a few requests for it, but if anyone has other suggestions, feel free to ask.