Another thing you could try is this(untested)....
Code:
action move_paddle()
{
   var pspeed = 4;
   while(1)
   {
you = NULL;
      If (key_a)  //move left
         c_move(me, nullvector, vector(-pspeed*time_step, 0, 0), GLIDE);
      If (key_d)  //move right
         c_move(me, nullvector, vector(pspeed*time_step, 0, 0), GLIDE);
if(you)
{   
    toggle(you, BRIGHT|UNLIT|TRANSLUCENT);
    wait(1);
    toggle(you, BRIGHT|UNLIT|TRANSLUCENT);
}
      wait(1);
   }// end while
}// end action

The object it is colliding with should sort-of flicker enough to be seen.
This will work if it is an entity, terrain or model I think.

"There is no fate but what WE make." - CEO Cyberdyne Systems Corp.
A8.30.5 Commercial