anchor.diff:        vertEdgeScroll = mkOption {
           default = ! cfg.twoFingerScroll;
           description = "Whether to enable vertical edge drag-scrolling.";
  +      };
  +
  +      additionalOptions = mkOption {
  +        default = "";
  +        example = ''
  +          Option "RTCornerButton" "2"
  +          Option "RBCornerButton" "3"
  +		'';
  +        description = ''
  +          Additional options for synaptics touchpad driver.
  +        '';
         };
   
       };
  
positive.code: 
        dev = mkOption {
          default = null;
  	example = "/dev/input/event0";
          description =
            ''
              Path for touchpad device.  Set to null to apply to any
  
negative.code:           Option "VertTwoFingerScroll" "${if cfg.twoFingerScroll then "1" else "0"}"
            Option "HorizTwoFingerScroll" "${if cfg.twoFingerScroll then "1" else "0"}"
            Option "VertEdgeScroll" "${if cfg.vertEdgeScroll then "1" else "0"}"
            ${cfg.additionalOptions}
          EndSection
        '';
  
  