Glad to help. I like your addition to the documentation.
In the email that came, you wrote “Would you know if that only applies to old iMacs or all Apple systems?!!”.
All I can say is that the same preference option appears in my wife’s iMac, which is a 2009 model. Mine has a USB keyboard, whereas hers is wireless. We are both using the same OS version. Later models may differ, but knowing Apple, the option will be unlikely to appear if it is not necessary.