Glyn,
You're right, it's in a different place on the Mac. Excel > Preferences > Edit. In all my years of using a PC and even Excel on the Mac I never had occasion to use, or even imagine, that feature. I am surprised that it's a permanent setting; not just a range format, not just for a document, but for all documents until the Preference is changed again.
Thanks for pointing it out. Good luck with your feature request in Numbers.
Jerry