In reply to:

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What about making soups "immune" to the "you need to sync" warning? ... the actual changes that you made that caused the soup to be modified would show up as dirty (i.e. in the "normal" playlists).

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Wouldn't this cause problems for people who have tunes not in any playlists? (I don't do this, but I'm told that one can). If such tunes were modified (e.g. by adding a "comment" tag), then would the user be able to find the changed tune?

/me thinks that "changed" would make a nice useful pseudo-tag to build a search view...