Thanks for explain once more.
I do understand what you are saying. I am however reluctant of adding certain features, or just functionality in general, because, as you probably have noticed, an important value in the vision of Animation Paper is to keep everything very straight forward, simple and easy. I will go a long way to keep it uncluttered.
Behaviour and functionality in Animation Paper is designed to give very optimised workflows, ie enable the user to work very efficiently. Therefore, with your case, you can actually press Space and start dragging immediately – even before the interface is visible. So if you have a tendency to move your cursor while you are waiting for the interface to appear, just know, that you don’t need to wait – simply press Space and press down with your pen immediately so you can do your panning. This way we also keep it in line with other software.