Autohotkey togglable rapidfire script.

rapidfire.ahk

Save either script as an .ahk file and run it (AutoHotKey must be installed)

Script 1:
  Rapid-fires as long as left click is held down.
  Usage: Run script, go into a game, press numpad+ to turn on the script -
  hold down left click to rapidly fire. Press numpad+ again to turn it off.

  ;----Copy below this line------;
  #Singleinstance, FORCE ;Without this you can accidentally run it twice.
  Suspend, On ;Start in off state so you can't accidentally rapid-fire.
  SetMouseDelay, 30 ;Miliseconds between each mouse click (Adjustable).

  NumPadAdd::
  Suspend, Toggle
  return

  LButton::
  while GetKeyState("LButton", "P") {
  Click, left
  }
  return
  ;----Copy above this line------;
  
  
;----------------------------------------------;

Script 2:
  Slightly different script that rapid-fires as long as it's on, regardless of -
  if you're clicking.
  Usage: Run script, go into a game, press numpad+ to start rapid-firing,
  press numpad+ again to turn it off. and numpad- to exit the script.

  ;----Copy below this line------;
  #Singleinstance, FORCE ;Without this you can accidentally run it twice.
  Suspend, On ;Start in off state so you can't accidentally rapid-fire.
  SetMouseDelay, 30 ;Miliseconds between each mouse click (Adjustable).

  loop
  {
      click
  }
  return

  NumPadAdd::
  Suspend,Toggle
  return

  NumPadMinus::
  exitapp
  return
;----Copy above this line------;