I'd also like to see some more options in regards to this post. I would like to have the ability to:
1) recursively copy the contents of a playlist...excluding the actual songs (Actual songs should should never be duplicated). By recursive-copy, I mean make a true 'copy' of everything in a playlist... not just a symbolic link.
2) Have some visual 'warning' showing you that you are manipulating a list that has other links to it. Similar to bonzi's suggestion.
3) Possibly a command to recursively convert a symbolically linked playlist into copied playlists (Excluding actual songs).
4) Possibly an option for a playlist: true/false option for 'always symbolically link'. This would be good for individual albums... Album contents should never change, and any changes that are made to an album should be global across the entire database.

If any of these suggestions are unclear, let me know and I will clarify/elaborate.
See also, my original post.


Mk2/40GB/Blue