Q: How can I allow tapping the right edge of the page to advance to the next page?

That should be how it works, tapping the right-hand edge of a page (the right-hand page if in landscape) in an ibook or PDF in iBooks on my iPad takes me to the next page - there is only a setting in Settings > iBooks to make both the left and right hand margins page forward instead of the left-hand default of going back a page. Does tapping the edge of the page work on any of your books and/or PDFs ?