I am in no way a programer and also have no idea how hard this would be to add to PSPDF, but I think it would be a great addition. Being able to view the PDF pages vertically instead of horizantally, it may be able to display an entire page without the need to scroll up/down/left/right. Hopefully someone here is already attempting to do so or atleast thinking about it. If this is too hard or time consuming to attempt then I am sorry for brining it up.
I do think it works really well, the pages load fast and it's in full color instead of eye stinging red (shutters at the thought of Virtual Boy).