There is one other special prefix in the current code, '*' for 'Note' if I remember correctly. You can use that however you want.
You can create an enhancement request as described in the first post in this thread. It would probably make more sense to be able to specify the contents of a custom column to be included in the generated catalog content, rather than using a special tag.
Another option would be to create a catalog of books you don't yet have in your library, and build a catalog of just those books. You could either filter on format:false or use a custom column.
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