+1 on the trackball.
I don't use one but I know several people who swear by them. Don't know what the learning curve is on a switch.
I always wished I had learned to use a ten key with my left hand. I spent years laying down my pencil, using the ten key, picking up my pencil and writing, laying down my pencil, etc. (Yes, it was YEARS ago). When I first started using a mouse I decided to do IT left handed. It feels completely natural to me and I almost can't use one right handed.
And back to the subject, as Lost Sheep suggested, turn your shellholder to the right side and use your right hand between the front and back posts for cases, bullets, etc.
Education teaches you the rules, experience teaches you the exceptions (Plagiarized from Claude Clay)