Great idea! You could do the same with a Tag, e.g. give them all a FavCom tag.
I was thinking that the dynamic approach to making collections has some advantages. ONe example I was thinking of is in making a "5 Star Commentary" or "Favorites" collection.
I like it. I use it very much in iTunes to add music to sync it with the iPhone. It is great it is possible now in Logos. I think combination of tags and ratings might open many new creative ways of sorting the books. We will see. Thanks Joe.