Feature request: Fill the cropped area with solid border

[Tup3x]

It would be really nice if we there would be an option to fill the cropped area with solid colour. In that case the picture resolution and aspect ratio would stay the same. I'd like to maintain the original image/video resolution but just add 1px black borders. Some games have issues when you enable AA (usually top and left side of the screen, 1px wide/tall area).

If it would be possible to replace cropped area with solid colour borders I could get rid of this issue while maintaining the original video/image resolution: