Does anyone know if you can program/change the factory speed limit settings on the Hill Descent Control? It's currently set at 20mph or lower before HDC will engage. I'd like to set it to be able to engage at 30-40 mph. We live in a mountain valley and are constantly traversing out of the valley down into the city. It's a steep grade, but 20mph is just too slow. I know you can manually down shift, but I'd rather use the HDC with the ABS. Any thoughts?