Hmmm, interesting idea but heres another one. Have a setting to move the hamburger menu (top left) onto the navbar left of feed (bottom left). The refresh and sort will be handled by the FAB in upcoming versions anyway so the top bar would not even be needed once the menu is added to the navbar. Thoughts?
Edit: here is a screenshot of tusky's navbar. The profile pic at the far left acts as the hamburger menu in thunder does.