The nook touch is able to rotate screen. I don't know why they "disabled" that option. Let me explain how I managed to do that:
I was surfing the internet with the hidden browser and googled some video to check youtube in nook touch. I clicked on one result that took me to a youtube page saying the video couldn't be streamed. That page changed the orientation of the screen to landscape which remained unchanged while browsing and reading the current book. After clicking HOME it all came back to portrait.