Further Keyboard Navigation
It would be tremendous to have the ability to launch the page organizer (with Thumbnails, Favorites, Outlines) via a keyboard shortcut. Furthermore, once in that window, it would be handy to be able to jump between the Thumbnails, Favorites, and Outlines views.
I use all 3 of those organizational features in different ways within the same notebook, but navigation can get cumbersome. Having these navigational shortcuts would be a game changer.