They really need to add the option to lock the orientation of comics on the NOOK. The lack of this feature really wasn't a problem until I got Batman: Court of Owls. Several pages in the graphic novel are intentionally printed sideways and upsidedown for effect, and it's difficult to read them when the comic keeps reorienting itself when I turn the device.
This is also true with some Fantasy novels that have maps printed at the beginning of the book in "landscape" orientation.
Yes, a "pin" feature to pin a particular page, without interfering with the normal flipping from portrait to landscape to read panels of different shapes.