This whole arranging thing is super confusing but this makes it fairly easy!
Recently I became hell-bent on printing zines on both sides but then folding them in the "single-sided/side-fold" method, this way the reader needs to cut open the pages. I ended up making it work through a long complex process. Could be a cool feature to add though!
How I did it: Starting from an 8 page document, create a pdf containing pages 1,4,5,8 (which may be called 0,3,4,7 depending on software), then create another pdf with pages 2,3,6,7. Now use an online tool to reverse the page order of the second pdf (so it goes 7,6,3,2). Feed both pdfs through The ZineArranger separately, using Quarter Size/Single-Sided / Portrait / Side-Fold. Print on opposite sides of sheet and fold!