Originally Posted by Dr. Drib
I just found out that navigating through the chapters ONLY works if the toggle switch is moved UP or DOWN, even if the chapter is to the left or right.
That's right. The up/down on the jobstick moves you to the prev/next hyperlink on the page, regardless of where it is relative to the last one.
I've done a number of books where I've laid out the TOC in the form:
1 2 3 4 5
and, as you say, it is naturally to try to use "cursor right" to go to the next link rather than "cursor down". You soon get used to it, though.