Hello George,
Unfortunately, this didn't work. First, the Preferences are under the Edit menu in my version (not the File menu), but more importantly, there is no "Commenting" category in the Preferences dialogue box. I've searched in all of the categories that are there, from 3D to Identity to Startup to Updates and cannot find anything that I can uncheck that seems even similar to "Always use log-in name for Author".
I have looked through the Help files and I'm still coming up empty.
If you have any other thoughts, I'd love to hear them.
Thanks,
Jill