Back on my old Treo, I was an avid ebook reader (reading myself to sleep just about nightly). I am thrilled at the prospect of using a *much* larger screen with higher resolution, but worry about the screen flipping its orientation as I may roll over onto my side (I prefer to read ebooks in portrait). Is there a way to lock the phone into portrait, but ONLY for this app? I'd rather just "set it and forget it", rather than have to toggle something every time. Is this possible?