如何编写适用于罗技鼠标的简单Lua代码?

我正在尝试为罗技鼠标编写脚本，实现以下功能：

1.当左鼠标按钮被按下时，它将激活第一种情况 2.当按住右鼠标按钮并按下左鼠标按钮时，它将激活第二种情况

然而，无论我如何尝试，它都只能在第一种情况下工作。

EnablePrimaryMouseButtonEvents(true)

function OnEvent(event, arg)
  -- Case 1: Press only Button  1
  if (event == "MOUSE_BUTTON_PRESSED" and arg == 1 and IsKeyLockOn("scrolllock") == false) then
    Sleep(77)
    if (IsMouseButtonPressed(1)) then
      MoveMouseRelative(0, 4)
      Sleep(76)
    end
    if (IsMouseButtonPressed(1)) then
      MoveMouseRelative(0, 6)
      Sleep(62)
    end
    if (IsMouseButtonPressed(1)) then
      MoveMouseRelative(0, 5)
      Sleep(84)
    end

  --Case 2: Press button 1+2
  elseif (event == "MOUSE_BUTTON_PRESSED" and arg == 2 and IsKeyLockOn("scrolllock") == false) then
    Sleep(77)
    if (IsMouseButtonPressed(1)) then
      MoveMouseRelative(0, 8)
      Sleep(76)
    end
    if (IsMouseButtonPressed(1)) then
      MoveMouseRelative(0, 9)
      Sleep(62)
    end
    if (IsMouseButtonPressed(1)) then
      MoveMouseRelative(0, 0)
      Sleep(84)
    end
  end
end

我想为这个脚本添加更多的情况：

-当按下RMB时-》按下Lshift键 -当释放RMB时-》再次按下Lshift键

我在脚本的末尾添加了以下内容，但它不起作用。

elseif (event == "MOUSE_BUTTON_PRESSED" and arg==2 and IsKeyLockOn("scrolllock")==false) then
    PressAndReleaseKey("lshift")

elseif (event == "MOUSE_BUTTON_RELEASED" and arg==2 and IsKeyLockOn("scrolllock")==false) then
    PressAndReleaseKey("lshift")

如果我想添加第三种情况：按下LAlt+LMB，那我应该把IsModifierPressed("lalt")放在哪里？我尝试了以下代码但失败了

function OnEvent(event, arg)
  if (event == "MOUSE_BUTTON_PRESSED" and arg == 1 and not IsKeyLockOn("scrolllock")) then
    if not IsMouseButtonPressed(3) then -- 3 = 右鼠标键（与arg==2相同）
      -- Case 1: Press only LMB
    if IsModifierPressed("lalt") then
      -- Case 3: Press LAlt+LMB
   else
      -- Case 2: Press RMB+LMB
    end
  elseif ((event == "MOUSE_BUTTON_PRESSED" or event == "MOUSE_BUTTON_RELEASED") and arg==2 and not IsKeyLockOn("scrolllock")) then
    PressKey("lshift")
    Sleep(50)
    ReleaseKey("lshift")
  end
end