Per-user media subdirectory

Hi!
I've been looking around black_candy, and the simplicity of the app is really nice.
I'd love to use this for my family, but we all listen to different music styles. What I would need is a way to specify a subfolder for each user. The music that's in a user's subfolder is not accessible to other users, and music that's outside of user subfolders is available to all.

Thanks!