How do I create a camera script like one that would be in a racing game?

I am looking for a way to create something like a smooth follow script. However, I would like to have the camera rotate on the z and x axises so it can redefine the xyz axis positions in the controls for my character. If it's an edit I can make on the camera script, here's the camera script:

 /*
 This camera smoothes out rotation around the y-axis and height.
 Horizontal Distance to the target is always fixed.
 
 There are many different ways to smooth the rotation but doing it this way gives you a lot of control over how the camera behaves.
 
 For every of those smoothed values we calculate the wanted value and the current value.
 Then we smooth it using the Lerp function.
 Then we apply the smoothed values to the transform's position.
 */
 
 // The target we are following
 var target : Transform;
 // The distance in the x-z plane to the target
 var distance = 10.0;
 // the height we want the camera to be above the target
 var height = 5.0;
 // How much we 
 var heightDamping = 2.0;
 var rotationDamping = 3.0;
 
 // Place the script in the Camera-Control group in the component menu
 @script AddComponentMenu("Camera-Control/Smooth Follow")
 
 
 function LateUpdate () {
     // Early out if we don't have a target
     if (!target)
         return;
     
     // Calculate the current rotation angles
     var wantedRotationAngle = target.eulerAngles.y;
     var wantedHeight = target.position.y + height;
         
     var currentRotationAngle = transform.eulerAngles.y;
     var currentHeight = transform.position.y;
     
     // Damp the rotation around the y-axis
     currentRotationAngle = Mathf.LerpAngle (currentRotationAngle, wantedRotationAngle, rotationDamping * Time.deltaTime);
 
     // Damp the height
     currentHeight = Mathf.Lerp (currentHeight, wantedHeight, heightDamping * Time.deltaTime);
 
     // Convert the angle into a rotation
     var currentRotation = Quaternion.Euler (0, currentRotationAngle, 0);
     
     // Set the position of the camera on the x-z plane to:
     // distance meters behind the target
     transform.position = target.position;
     transform.position -= currentRotation * Vector3.forward * distance;
 
     // Set the height of the camera
     transform.position.y = currentHeight;
     
     // Always look at the target
     transform.LookAt (target);
 }

Or here's the character movement script:

 #pragma strict
 
 function Start () {
 
 }
 
 function Update () {
     if(Input.GetKey ("w")) {
         rigidbody.AddForce (-Vector3.back * 30);
         if(Input.GetKey ("space")){
             rigidbody.AddForce (-Vector3.back * 60);
         }
     }
     if(Input.GetKey ("s")) {
         rigidbody.AddForce (-Vector3.forward * 30);
     }
     if(Input.GetKey ("d")) {
         rigidbody.AddForce (-Vector3.left * 30);
     }
     if(Input.GetKey ("a")) {
         rigidbody.AddForce (-Vector3.right * 30);
     }
     if(Input.GetKey ("up")) {
         rigidbody.AddForce (-Vector3.back * 30);
         if(Input.GetKey ("space")){
             rigidbody.AddForce (-Vector3.back * 60);
         }
     }
     if(Input.GetKey ("down")) {
         rigidbody.AddForce (-Vector3.forward * 30);
     }
     if(Input.GetKey ("right")) {
         rigidbody.AddForce (-Vector3.left * 30);
     }
     if(Input.GetKey ("left")) {
         rigidbody.AddForce (-Vector3.right * 30);
     }
 }