[Zubersoft]

If you use the two finger tap to switch the current tool to the pan tool, then you can just move the page over slightly, two finger tap again, and then make your annotation. I don't think I can combine pinch zooming with panning though. Having said that, when I pinch zoom on the sides of the score or the corners, it centers the screen on that area, so I don't have to pan. Is that not working for you?