I would like to be able to scroll the preview window. My use case is that I am overlaying two camera angles for a stereoscopic 3D shoot and using the pan/crop tools to converge them. I want to preview at full resolution but this usually means the preview is cropped and sometimes the feature I want to converge on is in the cropped area.
From the research I've done, it seems that you can't scroll the preview window. If that's true, let me just add my vote for that as a feature in a future release.