Click and show file path in title bar
I am used to right-clicking or CMD-clicking the title bar to jump out to the folder that contains the ebook. It is a standard interface item but is missing in Bookle.
Hmm, that's an interesting thought. Since Bookle stores all ebooks internally, such a feature would let you get to the deep enclosing folder easily. But at the same time, a full library management feature could offer the same thing in a potentially non-destructive way (if you dragged a file out of Bookle using the library management, you could end up with a copy, whereas if you moved a book out from underneath its nose in the Finder, that would cause problems).