To parallel the various ideas for playlists playing as a single track, here's another threepence h'penny's worth...

A lot of albums have this "seamless track" idea where several tracks run into each other, Pink Floyd's stuff being the good example. However, not all of them have the entire *album* grouped together; I have got a few which group together maybe two or three tracks and the rest are just conventional, stand-alone tracks.

So I wish...

1) I could selectively group specified tracks with no breaks (at list construction time only), rather than an entire playlist

2) Change the playlist's grouping characteristics *after* the list has been created, rather than have to re-create the entire list again.