option effects in system menus

On the Mac it's pretty standard to allow the user to access more obscure but useful actions by holding the Option key while viewing a program
menu. This is currently not possible to implement in Qt without installing a Carbon event handler on the menubar. It would be useful if Qt could provide such functionality without having to use native code. In other words, when creating QAction's for menus the
user could provide alternative text and an alternative signal to be emitted when the Alt/Option key is pressed. Perhaps this information could be set by calling a member function of QAction?