From Riccardo Corsi, introduced CameraManipulator::updateCamera() method that allows more Camera properties to be controlled by the CameraManipulator.

include/osgGA/CameraManipulator

@@ -87,6 +87,10 @@ class OSGGA_EXPORT CameraManipulator : public GUIEventHandler
         /** get the position of the manipulator as a inverse matrix of the manipulator, typically used as a model view matrix.*/
         virtual osg::Matrixd getInverseMatrix() const = 0;
 
+        /** update the camera for the current frame, typically called by the viewer classes. 
+            Default implementation simply set the camera view matrix. */
+        virtual void updateCamera(osg::Camera* camera) { camera->setViewMatrix(getInverseMatrix()); }
+
         /** Get the FusionDistanceMode. Used by SceneView for setting up stereo convergence.*/
         virtual osgUtil::SceneView::FusionDistanceMode getFusionDistanceMode() const { return osgUtil::SceneView::PROPORTIONAL_TO_SCREEN_DISTANCE; }