I’d love to have some camera controls which work the same regardless of the current mode, even some awkward ones - this would make it possible to control the camera from outside at least by simulated keystrokes and/or mouse events. (Better yet, have some proper way to remote control this, as hinted by @ghutchis here.) I made my own 3D trackball I use for camera control in pymol and connecting it to Avogadro is very complicated due to the modal nature of the GUI.
Even outside of my 3D billiard ball niche, I guess some mode independent camera control would be welcome.