I definitely understand the confusion there - I actually don't allow distortion. I will honor the desired width/height as much as possible while still maintaining the original aspect ratio of each page. Based on some initial tests without reviewing the code, I believe the smaller of the two values (width and height) are used to figure out the resulting page dimension. So if you put 100x4000, it's going to use 100 as the width and figure out the largest height possible at that width while still maintaining the page aspect ratio. I think on the tablet I decided it didn't make sense to ask for both if I was just going to clamp to the smaller value. I'll have to update the companion to behave the same way.
Mike
Mike