func cmd(event C.CGEventRef) { C.AddActionKey(_VK_CMD, event) }
func ctrl(event C.CGEventRef) { C.AddActionKey(_VK_CTRL, event) }
func alt(event C.CGEventRef) { C.AddActionKey(_VK_ALT, event) }
func shift(event C.CGEventRef) { C.AddActionKey(_VK_SHIFT, event) }