Actually glad you posted, I've fought panos before at the end due to the transparent space warped on the image due to panning. Ideally you take more photos and add to the pan, but most of us usually don't. Never even knew about the perspective crop. Thank you!! Might have to dig into the archives and see if the Grand Canyon panos are actually usable.
Need to get you a mic! Pretty good for pointing a camera at a bright screen though, I've actually been looking for a capture program/card/whatever.