I'm currently using the Auto-Sync feature to sync a lot of playlists to my music device. Most of the playlists I sync are grouped in the same folders. When I create a new playlist I want to sync, I have to open the Auto-Sync Settings of my device, scroll through the list and find what is missing from my sync.
I think it would be great if the playlist list in the Auto-Sync Settings tab could be displayed as a treeview for easier browsing, and/or gave the possibility to select complete folders in one click (and remembers the folder as selected rather than individual playlists).