I would be useful to move the pivot point with the arrow keys, to make small adjustments, right now you have to be precise with the mouse, which isn't great if you want a specific pixel.
It would also be nice to have buttons that set the pivot at specific predefined positions like centered, mid-bottom, etc. Even better if you could select a bunch of sprites and click those buttons to set it for all (eg: to set it to center in batch).