from page 6 :
<ControlsInfo>
Any action can be controlled by unlimited number of duplicating controls:
<Action name="fire" control="joystick:0:button:5"/>
<Action name="fire" control="Space"/>
<Action name="fire" control="VK_LBUTTON"/>
The sample shows you can fire using either joystick button 6 (5+1) or Space key, or mouse left-click.
Any control assignment can be changed.

Concerning the fire action controls : space key and mouse Left click are OK but I don't understand the comment "joystick button 6 (5+1)"  I just read above "joystick:0:button:5". Doesn't that mean the Button 5 is the active button to fire ?

Is there a way to precise that I'm using the Thrustmaster Hotas Cougar as my joystick ?

and for my info what is VK in VK_LBUTTON ?

Thanks