I often do a 'second edit' of my images a day later and quickly fly through my pictures in preview mode colour coding. As the colour code is a tiny spec in the corner, I often re-code an image by mistake. To stop me doing this I have to apply a star rating, then after my edit, set the colours back according to the star rating.
What I'd like to request is that instead of the colour code being a small blob in the corner of the preview window, the user should have the option to make the whole background of the preview window (the area to the sides or above the image) the colour code. That way it would be impossible to miss an image that has been colour coded.
