[Geoff Bacon]

Instead of "turning backward by half-pages",  you could try editing the page order   e.g. 1,2,3,2,3,4 (where you go back to page 2 after the first "page 3"). This would effectively mean that you are always moving "forward" through the document.
Having said that, I've no idea how that would work with half pages!

Geoff