I will not argue that people in north Florida (where I'm from) and east
Texas (where my parents are from) are normal or sensible in any way, but
I have never in my life heard anyone use "y'all" as a singular pronoun. 
"All y'all," in my experience, is a more assertive form of "y'all."
e.g.
   "Y'all wanna go muddin' in the clay pits tonight?"
   "Kin Ah come too?"
   "All y'all kin come!"

And to put this back on topic, I'm no longer stuck in windows hell. 
Thanks to Carl I have everything working now except email (which is why
I'm in Windows at the moment).  I think I have my .muttrc correct except
I have forgotten my password, so I'm working on that.  I know exim is
not right, but one step at a time.  :)

Lorry

Mark Browne wrote:
> 
> For what it's worth . . .
> I just got back from Virginia Beach.
> I posed the plural question to some natives.
> The consensus is that the plural form is:
> All y'all.
> 
> Mark Browne