I'm no authority but its pretty obvious that being able to shoot with either hand is advantageous. Some of the greats had this skill, most notably Buddy, Keith, Sigel and Wade Crane.
I think the learning curve is faster the second time and I recommended 30 minutes of practice a day for 30 days.to develop your opposite hand. I lasted ten days in this regimen a few years back and even that greatly improved my left handed play.