mw3 rapid fire script help with editing

Can somebody edit this so that ([) takes away 2 from the sleep and (]) adds 2 to sleep so while your ingame you can adjust it to your liking.



~LButton::
GetKeyState, state, Scrolllock, T
if state = D
{
Goto, FireIt
}
return

FireIt:
Loop
{
GetKeyState, LButtonState, LButton, P
if LButtonState = U
{
break
}
MouseClick, left,,, 1, 0, D
Sleep 8
MouseClick, left,,, 1, 0, U

}
return