I often take a screenshot of something and then use Paint.NET to crop it. But to be precise I have to carefully move the mouse to an edge before cropping. I would like to be able to adjust the square selection area using the keyboard by 1 pixel at a time. Perhaps this already exists in a similar form, but not exactly what I want. I would like to hit ctrl+up to just move the top side up while leaving the bottom side where it is. Simply using the arrow keys could move all sides equally. This way I can highlight the square region without being completely accurate and then use ctrl+arrows to precisely select the region before cropping.