Suggestion for new Gradient Filter option

I've been loving the gradient filter in Lightroom.  However, the software would really benefit from a gradient filter option that works in two directions...kind of a reverse grad option. 

Consider a gradient where if you click and drag the grad from top to bottom on the image, the maximal effect of the adjustment sliders occurs in the middle of the gradient and falls off both downward and upward from where the grad click started and ended.