For joystick control, you may try the following code :

Code:

---

var speed = 5;  // play with 5
var jForce;
action my_car()
{
   while(1)
   {
      jForce = (joy_6 - joy_5);
      // move forward and backward
      c_move(my,vector((joy_6-joy_5)*speed*time_step,0,0),nullvector,GLIDE);
      // turn left and right
      c_rotate(my,vector(-joy_force.x*time_step*jForce,0,0),USE_AXIS);

      // follow cam
      vec_set(camera.x,vector(-200,0,40));  // play with the vec position
      vec_rotate(camera.x,my.pan);
      vec_add(camera.x,my.x);
  
      //camera.pan += 0.2 * ang (my.pan - camera.pan) * time_step; // line A
		
      vec_set(camera.pan,my.pan);   // line B

      wait(1);
   }
}

---

If you want a little bit camera lag uncomment line A and comment out line B.
My joystick may not the same as yours, try to modify those joy_???? youself.

Have fun!