All I want to be able to do is to duplicate a playlist and then be able to make new playlists that are similar to the copied one.
Just as you suggest!
I would also like to be able to create a few files within my Auto Playlists, so that I can group my Auto Playlists by eg "Classical" and "Jazz" etc, so as not to have a long, long list of Auto Playlists. Just as one is able to do in iTunes.