I never did take into consideration that inevitably we must boot into Showtime lulz. So I suppose for your "Video" suggestion, that holds true. For an end-user such as myself it's just a lot more sophisticated to be able to browse sub-folders and locate a specific file faster to view/hear/play. The grouping implementation for the Retro Sections is ingenious in it's own right but does not translate well to the "Picture," Music," and "Video" column, in my opinion, of course.
Off-topic a little, the reason I decided to learn and play with MM's source code was to try to implement my own form of file management of the aforementioned columns (i.e sub-folder display.) But since I'm a complete beginner I'm sure you could implement this faster than I could post pointless comments about how the game that I "downloaded" isn't working lulz (sarcasm)
As saku said, not trying to demand anything from you dean, we don't need this per say, but it would benefit the freedom of the user. Cheers!