Sardo Numspa
Super Freak
I see a lot of ANH (HATE that quantifier) shots, particularly with the Stormtrooper rifle, he's holding it in his left hand. Upon further review, you can find both weapons in either hand. I figured that was the logic behind no right trigger hand. Oh, well.
One of my twin boys is lefty. Writes left, but throws and hits righty. Interesting. I'm righty and can't do squat left handed.
I am also like your son... I use my left for precise movement stuff (writing, scissors, even shooting firearms), but I'm right handed for most other stuff (almost all sports, for example). Actually, if I was Luke myself, that's exactly what I would be doing... using the gun in my left, and lightsaber in my right...