Moving a character whilst also aiming with a crosshair TPS

Hi guys, thanks for replying. It seems like my message has been cut off half way for some reason. I will repost:

Hi guys! I am currently creating a infinite runner which automatically moves the character forwards and the terrain backwards. I wanted to use the mouse as the cursor to shoot objects on screen, whilst also rotating the character left or right (doesn't have to be exactly where the mouse is pointing, rotation of character should be a -60* to 60*). At the moment I am using a mouse orbit script, but the mouse positioning is awkward, sometimes to the side of the character even when he is running forward (see screenshot attached). Is there a way I am able to have it so that if the cursor/crosshair is exactly in the middle of the screen, the character will run forwards and if left or right (depending on how far out it is) then the character will travel in that direction?

 var target : Transform;
 var distance = 10.0;
 
 var xSpeed = 250.0;
 var ySpeed = 120.0;
 
 var yMinLimit = -20;
 var yMaxLimit = 80;
 
 private var x = 0.0;
 private var y = 0.0;
 
 var maxZoom : float = 15;
 var minZoom : float = 3;
 //var speedZoom : float = 10;
 
 
 @script AddComponentMenu("Camera-Control/Mouse Orbit")
             
 function Start () {
     var angles = transform.eulerAngles;
     x = angles.y;
     y = angles.x;
 
     // Make the rigid body not change rotation
        if (rigidbody)
         rigidbody.freezeRotation = true;
 }
 
 function LateUpdate () {
     if (target) {
         x += Input.GetAxis("Mouse X") * xSpeed * 0.02;
         y -= Input.GetAxis("Mouse Y") * ySpeed * 0.02;
          
          y = ClampAngle(y, yMinLimit, yMaxLimit);
            
         
         var rotation = Quaternion.Euler(y, x, 0);
         var position = rotation * Vector3(0.0, 0.0, -distance) + target.position;
         
         target.rotation = rotation;
         transform.rotation = rotation;
         transform.position = position;
         distance  = Mathf.Clamp (distance + Input.GetAxis("Mouse ScrollWheel"), minZoom, maxZoom);
             }
 }
 
 static function ClampAngle (angle : float, min : float, max : float) {
     if (angle < -180)
         angle += 180;
     if (angle > 180)
         angle -= 180;
     return Mathf.Clamp (angle, min, max);
 }