ok, gotta say...I love love LOVE the sorting changes. That is one of my own OCD issues. Along with the need to carry around every book, photo, mp3 and video i own, on the crazy off chance i might need to view it...LOL
If a match cannot be found based on the available fields, perhaps prompting the user with a list of books that exist on the device, but not in the calibre library, with the option of removing them?
Sorry, developer brain kicking in... again, LOVE LOVE LOVE the sorting fixes.