Or, like PrinceScamp suggested, you could get a program like fraps. When the program is running you can hit a printscreen button, and it will instantly save the screenshot to a pre-designated directory. So using this method, you could take as many screenshots as you want instantly. Also as a sidenote, many games have a built in feature that lets you instantly take a screenshot, so maybe a similar feature will be added to M&B in the future.