Visual Way to Contract and Feather a Marquee Selection

PHOTOSHOP DEVS: Currently, after making a marquee selection (e.g. selecting a person in a photograph) the procress for contracting and feathering that selection is very number-oriented. 5 pixels? What does a 5 pixel feather look like? 5 pixels looks very different when working with a low-res photo vs. a high-res photo. If you don't like the feathering amount after you apply it then you have to start over. I propose a visual way to contract, expand, and feather a marquee selection (similar to the brush adjustment mathod). What if holding control+option+click dragging left, right, up, and down could give you a red overlay that showed you visually what that new selection would look like?