Horror Crouch Script Help

I have a crouch script for a horror game, so when i press "c", the player crouches close to the floor so it can hide under tables and beds. I need help with 3 problems that i can't fix, in this order of priority:

1)Slow the crouch action (make it smother, because when i press "c" i crouch like in 1 second)

2)When i go under the table, I can't stand up(that's ok like that), but when i crouch out of it, i automatically stand up, still don't know why...

3)I run and walk when crouching, i would like that this script disables that and crouch at a new slower speed than walking or running.

I would post here my Crouch script and my Player script, i would really apreciate any kind of help in any of the 3 points, please!

Crouch Script:

 var crouchSpeed : float = 3; // crouching speed, not working...
     
     private var isCrouching : boolean = false;
     private var isInCrouchArea : boolean = false;
 
     function Start ()  
 
     {
     isCrouching = false;
     }
 
     function Update ()
     {  
 
     if (Input.GetKeyDown ("c"))
     
     {  
 
     if(!isCrouching){
   
     isCrouching = true;
     speed = crouchSpeed;
     transform.position.y -= 3.5;      
     transform.localScale.y = 1;
 
     }
 
     else if (!isInCrouchArea){
 
     isCrouching = false;
     transform.position.y += 5.5;            
     transform.localScale.y = 4.5;
 
     }
     }
     }
 
     function OnTriggerStay( other : Collider )
 
     {
         if ( other.gameObject.tag == "crouchArea"  )
         {
 
            if ( !isInCrouchArea )
            {
         isInCrouchArea = true;  
 
         }
     }
     }
 
     function OnTriggerExit( other : Collider )
 
     {
         if ( other.gameObject.tag == "crouchArea" )
 
         {
     isInCrouchArea = false;   
 
    if(isCrouching){
 
     isCrouching = false;
     transform.position.y += 5.5;            
     transform.localScale.y = 4.5;
  }  
  }
  }

The Player Script:

 var walkSpeed = 6.0;
 var runSpeed = 11.0;
 var crouchSpeed = 3.0;
  
 // If true, diagonal speed (when strafing + moving forward or back) can't exceed normal move speed; otherwise it's about 1.4 times faster
 var limitDiagonalSpeed = true;
  
 // If checked, the run key toggles between running and walking. Otherwise player runs if the key is held down and walks otherwise
 // There must be a button set up in the Input Manager called "Run"
 var enableRun = true;
 var enableCrouch = true;
  
 var jumpSpeed = 8.0;
 var gravity = 20.0;
 
 var enableFallingDammage = true;  
 // Units that player can fall before a falling damage function is run. To disable, type "infinity" in the inspector
 var fallingDamageThreshold = 10.0;
 var fallingDammageMultiplier = 2;
  
 // If the player ends up on a slope which is at least the Slope Limit as set on the character controller, then he will slide down
 var slideWhenOverSlopeLimit = false;
  
 // If checked and the player is on an object tagged "Slide", he will slide down it regardless of the slope limit
 var slideOnTaggedObjects = false;
  
 var slideSpeed = 12.0;
  
 // If checked, then the player can change direction while in the air
 var airControl = false;
  
 // Small amounts of this results in bumping when walking down slopes, but large amounts results in falling too fast
 var antiBumpFactor = .75;
  
 // Player must be grounded for at least this many physics frames before being able to jump again; set to 0 to allow bunny hopping 
 var antiBunnyHopFactor = 1;
  
 private var moveDirection = Vector3.zero;
 private var grounded = false;
 private var controller : CharacterController;
 private var myTransform : Transform;
 private var speed : float;
 private var hit : RaycastHit;
 private var fallStartLevel : float;
 private var falling = false;
 private var slideLimit : float;
 private var rayDistance : float;
 private var contactPoint : Vector3;
 private var playerControl = false;
 private var jumpTimer : int;
  
 private var charHeight : float; //Initial height 
  
 function Start () {
     controller = GetComponent(CharacterController);
     myTransform = transform;
     speed = walkSpeed;
     rayDistance = controller.height * .5 + controller.radius;
     slideLimit = controller.slopeLimit - .1;
     jumpTimer = antiBunnyHopFactor;
     oldPos = transform.position;
 }
  
 function FixedUpdate() {
     var inputX = Input.GetAxis("Horizontal");
     var inputY = Input.GetAxis("Vertical");
     // If both horizontal and vertical are used simultaneously, limit speed (if allowed), so the total doesn't exceed normal move speed
     var inputModifyFactor = (inputX != 0.0 && inputY != 0.0 && limitDiagonalSpeed)? .7071 : 1.0;
  
     if (grounded) {
         var sliding = false;
         // See if surface immediately below should be slid down. We use this normally rather than a ControllerColliderHit point,
         // because that interferes with step climbing amongst other annoyances
         if (Physics.Raycast(myTransform.position, -Vector3.up, hit, rayDistance)) {
             if (Vector3.Angle(hit.normal, Vector3.up) > slideLimit)
                 sliding = true;
         }
         // However, just raycasting straight down from the center can fail when on steep slopes
         // So if the above raycast didn't catch anything, raycast down from the stored ControllerColliderHit point instead
         else {
             Physics.Raycast(contactPoint + Vector3.up, -Vector3.up, hit);
             if (Vector3.Angle(hit.normal, Vector3.up) > slideLimit)
                 sliding = true;
         }
         
         // If we were falling, and we fell a vertical distance greater than the threshold, run a falling damage routine
         if (falling) {
             falling = false;
             if (myTransform.position.y < fallStartLevel - fallingDamageThreshold && enableFallingDammage == true)
                 ApplyFallingDamage (fallStartLevel - myTransform.position.y);
                 
         }
         
         if (Input.GetKey(KeyCode.LeftShift) && enableRun == true)
         {
             speed = runSpeed;
         } 
         
         else if (Input.GetKey("c") && enableCrouch == true)
         {
             speed = crouchSpeed;
         }
         
          else
         { 
             speed = walkSpeed;
         }
 
         // If sliding (and it's allowed), or if we're on an object tagged "Slide", get a vector pointing down the slope we're on
         if ( (sliding && slideWhenOverSlopeLimit) || (slideOnTaggedObjects && hit.collider.tag == "Slide") ) {
             var hitNormal = hit.normal;
             moveDirection = Vector3(hitNormal.x, -hitNormal.y, hitNormal.z);
             Vector3.OrthoNormalize (hitNormal, moveDirection);
             moveDirection *= slideSpeed;
             playerControl = false;
         }
         // Otherwise recalculate moveDirection directly from axes, adding a bit of -y to avoid bumping down inclines
         else {
             moveDirection = Vector3(inputX * inputModifyFactor, -antiBumpFactor, inputY * inputModifyFactor);
             moveDirection = myTransform.TransformDirection(moveDirection) * speed;
             playerControl = true;
         }
  
         // Jump! But only if the jump button has been released and player has been grounded for a given number of frames
         if (!Input.GetButton("Jump"))
             jumpTimer++;
         else if (jumpTimer >= antiBunnyHopFactor) {
             moveDirection.y = jumpSpeed;
             jumpTimer = 0;
         }
     }
     else {
         // If we stepped over a cliff or something, set the height at which we started falling
         if (!falling) {
             falling = true;
             fallStartLevel = myTransform.position.y;
         }
  
         // If air control is allowed, check movement but don't touch the y component
         if (airControl && playerControl) {
             moveDirection.x = inputX * speed * inputModifyFactor;
             moveDirection.z = inputY * speed * inputModifyFactor;
             moveDirection = myTransform.TransformDirection(moveDirection);
         }
     }
  
     // Apply gravity
     moveDirection.y -= gravity * Time.deltaTime;
  
     // Move the controller, and set grounded true or false depending on whether we're standing on something
     grounded = (controller.Move(moveDirection * Time.deltaTime) & CollisionFlags.Below) != 0;
 }
  
 function Update () 
 {
 
 }
  
 // Store point that we're in contact with for use in FixedUpdate if needed
 function OnControllerColliderHit (hit : ControllerColliderHit) {
     contactPoint = hit.point;
 }
  
 // If falling damage occured, this is the place to do something about it. You can make the player
 // have hitpoints and remove some of them based on the distance fallen, add sound effects, etc.
 function ApplyFallingDamage (fallDistance : float) {
     gameObject.SendMessage("ApplyDammage", fallDistance*fallingDammageMultiplier);
     Debug.Log ("Ouch! Fell " + fallDistance + " units!");    
 }