Please add ability to lock playlists to be able to prevent unintentional adding or deleting of songs in playlists.
As it is now, it is far too easy to delete and/or change a playlist unintentionally (even without being aware, since there are no warnings or notifying messages to user). The only way of knowing is to look at the top listing indicating number of songs in playlist and playlist total length.
Update: This idea has been submitted again here:
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