It's very hard to follow some of the book on the library priority list. If two book are called Matthew, you are not sure which are the books you have there, if they are 2 different commentaries, and which ones. Also, it would be great if double clicking the books on the list would open them, or hovering over with the mouse would pop up the cover to easily identify them.
Another great feature for the priority list could be line dividers, so you could separate different kinds of books, like bibles and commentaries. Easily identifying the different kind of books easier to manage.