Csg subtraction func in need of adjustments

Again I appreciate constructor and the time that went it developing this tool. As an avid user I have noticed that the csg subtraction does not work in the standard way (standard boolean subtract). If you select 2 shapes that overlap each other then apply the csg subtraction tool only the geometry that overlaps remains. Generally when this tool is used in other programs the subtraction creates a "hole" in one of the 2 pieces of overlapping geometry.