Note:  I asked about this in #amarok, and sebr said that it wasn't available yet.  Thought i'd also post here to see if other people have ideas, etc.
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My hard drive space is scant, so i keep my music on a pair of DL dvds.  Unfortunately, the music on these DVDs is far from tagged...  almost every song has an album of its own, etc.  Normally, it would a simple (albeit tedious) task to add the tags to songs, and eventually end up with a nice, tagged collection.  Unfortunately, dvds are RO, and tags are tied to the files themselves.

I suggest some sort of local database for RO music, so that the tags can be edited and saved.  That is all. 

-Ben