First I will say that you have a very nice bit of software here. Thanks a lot for all the work you have put down into it.
I have a couple of requests:
1. I would like to see an option to let users administer their own playlists. All playlists should be possible to use by all users, but only the playlist owner should be allowed to change or delete it. The playlist owner could allow specific users to add / remove music to specific playlists. Currently my fear to allow others to make playlists is that they accidentally could delete existing playlists. I know that it could be solved by doing regular backups of the playlists.
2. I would like a feature to Add a playlist to the existing playlist. Currently you only can Open a new playlist so that it replaces the existing playlist. This will be the same as you already can do with artists, albums and tracks.
3. I would like a playlist to have one checkmark for each entry in the playlist. Then have buttons to Delete, Keep (opposite of Delete), Add (to playlist), Download the marked tracks.
Again thanks a million for this software.