The package feature in shoppincart allows you to create a package that the customer can build from multiple images... is it possible to create a package that can be applied to one image only, without having to add each print individually? (ie. 1-8x10, 2-5x7, 8-wallets, from the same image)
Currently not possible. You can define a package for one item but that item is also available for individual purchase. Package was designed with the assumption to bundle items that are on sale with a group discount. I understand you're expecting cart with only packages for sales. It has been requested before. I'll look into it for next update.