public void setRotationSpeed(float rotationSpeed) {
        this.rotationSpeed = rotationSpeed;
    }
Sets the rotate amount when user moves his mouse. The lower the value,
the slower the camera will rotate. Default is 1.

@param rotationSpeed Rotation speed on mouse movement, default is 1.
jme3-core/src/main/java/com/jme3/input/ChaseCamera.java