I'd like to suggest that you put something like an < and > on either side of the page that can be tapped to turn the page back (if to the left) and forward (if to the right). This would making turning pages much easier. Currently we have to swipe with multiple fingers and it takes multiple swipes to actually turn the page. A directional button like we see in kindle or iBooks would be so simple and make turning pages as easy as tapping the directional icon with the pen tip.