Once you have content in a folder, sure would be nice to be able to automatically play all titles within a folder. This is a request from my 3yo who wants to watch every episode of Bubble Guppies from start to finish.
Even better - Playlists that include folders and individual files. I'd be happy with a simple XML file at first but for the less technical, a UI would be needed. On the puter would be fine - not really needed via DLNA (which I suspect could not handle this sort of interaction anyway).