Steve will hopefully chime in here to verify this, but I think the "PA" switch flashes the high beam letting someone in front know you want to pass, which makes it a Euro model switch housing. Could be wrong, but seems like I heard that on this forum some time ago.
As far as the pin goes, I've always used aftermarket handlebars on my bikes which have no holes for wiring or the pin, so I pull the pins out. As long as the housings are screwed down tight, they don't move even without them.
I see that hcritz beat me to it, so now that's two votes for euro model.