PRS+ gives you the option of panning while in zoomlock mode, so you can drag the page. Another option is to use
briss to remove the margins from the pdf. You can then read more comfortably in landscape mode without zooming, or in a '1 column split' in portrait mode (with the next version of PRS+).
Lastly, your post should probably be moved to the 'regular' Sony Reader section; this is the developer section