Scrolling in ViewPoint 4

Back in ViewPoint 2, I could scroll an image using 2 fingers on the trackpad of my MacBook Pro or by stroking an external Magic Mouse. This behavior is the same as exhibited in PhotoLab, but for some reason it was disabled in ViewPoint 3, and it is still lacking in ViewPoint 4. I can scroll by pressing the spacebar, but the acrobatics involving with moving from the spacebar to scroll and using the Shift key for fine adjustments of perspective reference points are a bit of a nuisance. Is there some reason that scrolling via the trackpad or mouse was disabled? And is there any reason not to bring back this feature? Other than this complaint, ViewPoint 4 looks pretty solid to me, at least so far as I have briefly tried it.