I've just started playing with the beta and the camera controls are a bit of a pain. Without automatic pole lock the orientation messes up over time (have to re-orient with a button). With it scrolling is painful at the poles. I think left and right to rotate the planet about the camera would work well, with forward and back panning as normal. If you want to pan left and right, edge scroll as normal. With rotation controls you naturally orient the view to whatever makes sense at the time. No control scheme suits everyone, but I think this one and what is in place already would cover most people.