Hello ! 
Actually i try to modify my Config in game menu.
I try to add the USE GRENADE command to the menu, but it s doesn t work.. 
In game i can see the option, but i can link a key to this option....
This is my script :
    itemDef
    {
      name upgrades
      group optionsGrp
      type ITEM_TYPE_BIND
      text "Use grenade:"
      cvar "itemact gren"
      rect 96 210 192 15
      textalign ITEM_ALIGN_RIGHT
      textalignx 90
      maxPaintChars 20
      textaligny 12
      textscale .25       
      forecolor 1 1 1 1
      visible 0 
      action
      {
        play "sound/misc/menu1.wav"; 
      }
    }
i tryed with :
itemact "grenade" 
but doesn t work.
Can you help me ?
Thx