Make analog mouse wheel adjustments configurable and reduce sensitivity

lib/OpenLayers/Handler/MouseWheel.js

@@ -54,6 +54,12 @@ OpenLayers.Handler.MouseWheel = OpenLayers.Class(OpenLayers.Handler, {
      *     negative)
      */
     cumulative: true,
+    
+    /**
+     * Property: analogWheelPrecision
+     * {Integer} Adjust to get analog scroll wheel to feel right
+     */
+    analogWheelPrecision: 360,
 
     /**
      * Constructor: OpenLayers.Handler.MouseWheel
@@ -170,7 +176,7 @@ OpenLayers.Handler.MouseWheel = OpenLayers.Class(OpenLayers.Handler, {
                     e = window.event;
                 }
                 if (e.wheelDelta) {
-                    delta = e.wheelDelta/120; 
+                    delta = e.wheelDelta/this.analogWheelPrecision; 
                     if (window.opera && window.opera.version() < 9.2) {
                         delta = -delta;
                     }