如何设置两个鼠标按键来触发脚本？

我正在编写一个后坐力脚本，我想能用左键和右键来激活它。这是我目前的代码。我希望使用mb1和mb2来让它工作，不只是mb1。

function OnEvent(event, arg)
  OutputLogMessage("event = %s, arg = %d\n", event, arg)
  if (event == "PROFILE_ACTIVATED") then
    EnablePrimaryMouseButtonEvents(true)
  elseif event == "PROFILE_DEACTIVATED" then
    ReleaseMouseButton(2) -- 防止卡住
  end
  if (event == "MOUSE_BUTTON_PRESSED" and arg == 4) then
    recoil = not recoil
    spot = not spot
  end
  if (event == "MOUSE_BUTTON_PRESSED" and arg == 1 and recoil) then
    if recoil then
      repeat
        MoveMouseRelative(-2, 5)
        Sleep(10)
        MoveMouseRelative(2, -5)
        Sleep(21)
      until not IsMouseButtonPressed(1)
    end
  end
end