Flexible input fields

Sometimes when you have some input elements which represent X and Y coordinates, it is would be nice if you could change both values in each input field. For instance if you are in the X input field and pressed up the Y value should do a "up" on the Y value.
That is what you can do in the prototype below: Use arrow keys and see the circle move. Hold down SHIFT to change by a factor 10. Updated: : Added Q =previous, w =next circle. Also you can now click to select circle.