Modify onFire with keyboard Input

I want to get a different result from my onFire functions with the mouse if you hit the mouse for example and W is being held I want one result and if some other key is held I want yet another.

I found some code here:
http://www.garagegames.com/mg/forums/result.thread.php?qt=5985


Robert Blanchet Jr. posted something in that thread above which seemed useful by creating a new action map.

I've done this:

%hitType = 0;
   // Create some flags
   $bigSwingFlag = false;
   
   // Pop off all other existing action maps
   if( isObject(moveMap) )
      moveMap.pop();
   if( isObject(InventoryMap) )
      InventoryMap.delete();
   // others ... ?

   // Declare new action map for our gui control
   new ActionMap(InventoryMap);

   // Setup the keys
   InventoryMap.bind(keyboard, "w", bigSwing);

   // Push the action map
   InventoryMap.push();
               
   // default hand to hand weapon code
   %hitType = checkBinding();
   WeaponImage::onFireHandToHand(%this, %obj, %slot, %hitType); 
   %obj.setEnergyLevel(100);
   moveMap.push();
   return;
}
// <- phdana hth


function bigSwing(%val)
{
   echo("Big Swing Function");
   if(%val)
      $bigSwingFlag = true;
   else
      $bigSwingFlag = false;

}

function checkBinding()
{
   echo("Check Binding");
   %hitType = 2;
   if($bigSwingFlag)
      %hitType = 0;
 
   return %hitType;
}

Unfortunately, the bigSwing function is never getting called.