It woud be very helpful to have the opportunity to use your fingers navigate in more ways. A) For instants, use (starting from full page) 'zoom-out' with 2 or 3 finger to get to overview like the 4-square-icon does, with-out opening a new overlay windows. B) use 2 or 3 fingers to swipe faster through pages in a way the pages will move from the stack of pages.