Padding Color Shortcuts

[akovia]

Would it be possible to have shortcuts to set the padding to a specific color with or without a plugin?

I am constantly checking for flaws by viewing images against both black and white padding and would like a quicker way to do so. I already have shortcuts to set custom color and return to theme default, but it is still plenty of clicks and mouse drags to set the custom colors.

Just checking if this is something really involved, or easily doable.

Thanks!