I suppose the answer is to just press the 'page down' key, above the arrow keys and next to the button 'end' (near the number key on the right side of the keyboard).
I tested it and the 'page down' key doesn't miss any of the material as one would have to press it twice to go on to the next page. But when holding it down, it rapidly scrolls down texts, and photoreading should work. I just haven't been good at activating..
But anyway...
