When you try to open a book by typing its title into the command box, the list of matches there takes no account of prioritizations, which is unfortunate. I've prioritized the Battles translation of Calvin's Institutes, for example, and I would want that one (not any of the several other editions in my Library) to show up at the top of the list.
But in fact, it's last:

Maybe this isn't technically a "bug" in behavior that was meant to work the way I expect it and isn't working right. More likely it was just an oversight in the design, and the logic to do this was never thought up or implemented. But I think it should be. I'm reporting it as a bug rather than a suggestion. It appears to be a malfunction to any intelligent user who knows the product fairly well.
A related bug/oversight which was fixed recently in this code, which gives me hope that you'll also see this as something worthy of fixing (even if it's deferred to a later release because of where we are in this release cycle):
http://community.logos.com/forums/t/68047.aspx