3 Needed Features.
Add right click options to bookmarks that enable more customization, i.e. make a current bookmark a subsection of another bookmark. Currently this feature does not exist.
Allow Favorites bar to be moved to the top or bottom of the screen.
Merge the (More > Annotations > Show Annotations, Clear Annotations, and Flatten Annotations) tab and (View > Markup) tab together. It is a little bit frustrating to see related items in separate menus.