In his latest blog post Simon Pegg has provided a short history of Scotty's life prior to the movie. It's just for shits and giggles and obviously isn't OFFICIAL CANON! or anything.
He's even included various Scottish locations in the backstory to cover his bases....
CLICK ON THIS TO GO TO PEGGBLOG, YOU SWEATY GIMPS!
He's even included various Scottish locations in the backstory to cover his bases....

CLICK ON THIS TO GO TO PEGGBLOG, YOU SWEATY GIMPS!

I think it would do James Doohan proud. Sometimes I'm surprised at the stories actors come up with in preparation for a role to provide motivation, and that certainly sounds like the Scotty who started the bar fight rumble. Leave it to a Scotsman to take on the Klingons in a pub!