In adding tags that make the library useful to me, I discover that the provided categories combine two items that I've never thought of as the same: commentaries and Bible studies. By Bible studies I mean those books that are written for the average non-seminarian that include study hints and questions for discussion. By commentaries, I mean those books that contain information, analysis, etc. but not discussion questions. I'd like to see the two types of books separated - not only in the library but also in the passage guide. I'm quite willing to let them share a pane.