From Nico Kruithof, "Attached is a patch that makes the spherical manipulator frame rate independent. This is similar to what Lee did for the trackball manipulator a couple of months ago."

include/osgGA/SphericalManipulator

@@ -143,6 +143,17 @@ class OSGGA_EXPORT SphericalManipulator : public MatrixManipulator
         bool _thrown;
         bool _allowThrow;
 
+        /** The approximate amount of time it is currently taking to draw a frame.
+        * This is used to compute the delta in translation/rotation during a thrown display update.
+        * It allows us to match an delta in position/rotation independent of the rendering frame rate.
+        */
+        double _delta_frame_time; 
+
+        /** The time the last frame started.
+        * Used when _rate_sensitive is true so that we can match display update rate to rotation/translation rate.
+        */
+        double _last_frame_time;
+
         RotationMode    _rotationMode;
         osg::Vec3d      _center;
         double          _distance;