I would like to request a new feature. In my iTunes library I have about 6,000 songs in 143 playlists and I use playlist folders to keep track of them all.
When I sync my playlists the folder its self syncs as a whole new playlist with all of the songs from the other playlists in it instead of just being a folder for the other playlists.
This makes it much harder for when I want to find a certain playlist because I have to scroll through a huge list of them instead of selecting from a few folders.
tl;dr add playlist folder support please :P