I use goodnotes on an ipad when teaching large calculus classes. The vertical scroll feature with "mirror presenter page" is great, but currently the projected image is scaled so that the top and bottom of the student view matches the top and bottom of the ipad view. This forces the instructor to turn the ipad sideways (in landscape orientation) to make use of the full width of the projector screen. But then the zoom window interface hides at least 1/3 of the screen on the ipad, obscuring much of what the students see from the instructor's view. It would be nice to turn the ipad vertically (in portrait orientation) and still have the width of the page on the ipad match the width of the page on the projector. The zoom interface could then occupy clipped real estate that the students don't see anyway. Right now, if we zoom in to fill the width of the projector screen when the ipad is vertical, the sides of the pages are severely clipped on the ipad. With "vertical scroll" and "mirror presenter page", it seems much more natural to have the top and sides of the images match up and the bottom be clipped on the projector or the ipad. (If the tool position is set to "top", then I guess you'd want to align to the bottom of the page and clip the top if necessary)