I think this would be a great idea, as well... especially in the new version of DFP where I know that some of the ideas talked about on these forums indicated there would be a multiple quick upload. For photo galleries, I would love the idea of creating a thumb where first, you would decide to, say, take the very middle of image - through a cropping process - and then size the thumb to what ever is necessary. It definitely adds a cool effect... I have been able to create the effect through coding where using the thumb as a background image and then positioning the image at center inside a smaller div with the overflow set to hidden. But, this would be much easier with a crop function built right into the upload tool.