Yeah I can map just the PL2 button 3 to "exit" and that works, but that's no good if I'm playing three button games.
Just stuffed around with it some more and somehow lost my "1" input, don't know how but my PL1 start button that is mapped to "1" by default and also the "1" on my keyboard suddenly stopped working. I thought maybe I had accidentally remapped it to shift but I check that in notepad by holding 1 and pressing letters to see if I would get caps, but no.
Anyway I tried uninstalling the keyboard and rebooting, no fix, so I decided to load a restore point back to last week and that worked.
I seems to have Autohotkey working now to shutdown if I press PL1 start + PL2 start + Button 3 but I have to press all three of them a few times before it recognizes it and shuts down.