Editing Character Controller

hello, Here is my FPSInputControler.js:

Code (csharp):

1. private var motor : CharacterMotor;
2.  
3. // Use this for initialization
4. function Awake () {
5.     motor = GetComponent(CharacterMotor);
6. }
7.  
8. // Update is called once per frame
9. function Update () {
10.     // Get the input vector from keyboard or analog stick
11.     var directionVector = new Vector3(Input.GetAxis("Horizontal"), 0, Input.GetAxis("Vertical"));
12.    
13.     if (directionVector != Vector3.zero) {
14.         // Get the length of the directon vector and then normalize it
15.         // Dividing by the length is cheaper than normalizing when we already have the length anyway
16.         var directionLength = directionVector.magnitude;
17.         directionVector = directionVector / directionLength;
18.        
19.         // Make sure the length is no bigger than 1
20.         directionLength = Mathf.Min(1, directionLength);
21.        
22.         // Make the input vector more sensitive towards the extremes and less sensitive in the middle
23.         // This makes it easier to control slow speeds when using analog sticks
24.         directionLength = directionLength * directionLength;
25.        
26.         // Multiply the normalized direction vector by the modified length
27.         directionVector = directionVector * directionLength;
28.     }
29.    
30.     // Apply the direction to the CharacterMotor
31.     motor.inputMoveDirection = transform.rotation * directionVector;
32.     motor.inputJump = Input.GetButton("Jump");
33. }
34.  
35. // Require a character controller to be attached to the same game object
36. @script RequireComponent (CharacterMotor)
37. @script AddComponentMenu ("Character/FPS Input Controller")
38.  

I want to make it so that if I press "w" twice in 0.15 seconds, the speed is multiplied by 2; If you press space in 0.15 seconds, you can double jump. Also, how can I make the camera move so the character looks like it is walking?(only when its walking.) Thank you so much.