Is there anyway to modify the type of valve that controls the three point to be sensitive to the speed/position which with you move the lever like on full size tractors? I realize you can adjust the rate the implement drops but the raise cycle is either on or off. This makes it very difficult to feather out material with the box blade or grader blade. A partial solution is to throttle back to idle but that is not always very handy. This feature really limits the usefulness of the 3ph. Is there a retrofit valve that would do this?