OK man, you've got me committed to the spirit of using as many default settings as I can stand.
P> math preference, date format, auto-number headings, user language, image P> thumbnail size.
Which brings up the question "Which of (these and) the rest of my settings are not the default?"
Any easy way (for the average non-insider Junior User, not me with the source code) to tell in one click?
"Can I be allowed to examine a list and pick and choose which ones I want to restore the defaults of?"
Or must he hit the Slaughterhouse Button https://bugzilla.wikimedia.org/show_bug.cgi?id=17188