[Feature Request] Allow shadow size to be increased

[SPFabGerman]

I currently have my shadows configured as follows:

shadow = true;
shadow-radius =    10;
shadow-offset-y = -10;
shadow-offset-x = -10;
shadow-opacity = 1;

I quite like that, but I think it would look a bit nicer, if I could extend the shadows by 1-2 pixels, without blurring them further out. (So to say make the "center" of the shadow, which is currently under the window, a bit bigger, so that it slightly peeks out from under the window.)

With my current configuration the shadows start to blur out immediatly (when they "leave" the window), which makes them only barely noticable. But I would like them to stay at full opacity for like 1 or 2 pixels more before starting to blur, as to make them more visually apparent.

I tried simply increasing the radius and offset, but that only increased the radius of the blurring, which is not what I want.

I don't know if that is possible or how easy that would be, but I would quite like a config option like shadow-size-increase, which would increase (or decrease) the size of the shadow by the specified amount.