Actually there is a benefit to mousing with the left hand for everyone. It will free up your right hand for the keypad. This is very handy for entering numbers without having to release the mouse. We started doing this way back in 1985. I frequently teach new users to work this way. Officeworkers also benefit from this. It is tough to teach old dogs this new trick, however. Lots of people still keep their monitor jacked up on top of the cpu, too.
I have changed over to a Logitech trackball on the left side for my home system. It is much more precise and controllable that the mouse. There are multibutton versions of that pointer. Tryityoulllikeit.
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Crashj