Way to have comic book display two pages in landscape and one in portrait?
I'm trying to use iBooks Author to build a very simple manga-style graphic novel. It's based on a print book (with a lot of unconventional frame use), so I'm not using any fancy interactive features or individual-frame zoom-ins or such.
What I want to do is very simple and seems obvious: In landscape, I want two images (one for each page) to display side by side. In portrait, I want a single image to fill the whole display.
Preferably the portrait view will also display one image/page at a time and require page turns, like landscape, rather than a continuous vertical strip of images.
I assume I'm overlooking something really obvious, but I can't seem to figure out how to get this to work in portrait, and searching, or even buying a graphic novel template from a professional studio (they just disabled portrait), hasn't helped. I can set up landscape well enough, but if I check the option to share images with portrait, I just get little inline thumbnails in the continuous-scroll-style vertical view, when what I want is large, single-page images. (Perhaps what I'm really asking is how to disable the infinite scrolling mode in portrait view?)
I'm sure the answer to this will be something simple that makes me feel like an idiot, but I would tremendously appreciate any help.
iMac, OS X Mountain Lion, 1st Gen i7 27"