First off, I think PDF24 is great, particularly after the recent update! Well done.
I have a 12 page, 8.5" x 5.5" pamphlet I'd like to print on 8.5" x 11" paper, but I see no way of doing it efficiently. What I mean is I'd like to print page 1 next to page 12, page 2 with page 11, and so on so that the printed pages assemble correctly.