I am mostly a "right-ambi", but Kate is a "left-ambi". She writes and bowls with her left, but uses her right on the mouse. I don't mind lefties being leftis (even if it makes things like can openers and scissors difficult) but as a fiddle teacher, I insist that students play with left on the fingerboard and right on the bow. Violins are just too difficult to switch over, with the bass bar etc. Once saw a fiddler playing a standard set up on his right shoulder---weird, weird. He had not swapped anything except his hands. I could never even teach somebody to do that, let alone do it.