Currently when you apply the album sorting the tracks of an album are sorted by title rather than track#. The same happens with the artist/album sorting. I think it would be better that when you sort a playlist by album or artist/album the sorting respects the track# of the songs.
So an album that looks like this:
1. Charlie
2. Beta
3. Alpha
Will look like that when sorted in a playlist instead of looking like this:
3. Alpha
2. Beta
1. Charlie