I play guitar and my left hand is weaker than my right in cubing. I don't think it makes a huge difference.
If you play video games (especially rhythm games, like guitar hero/stepmania/etc) then I could see how you might have more finger speed, but I'm not sure how much it would help.
If you play video games (especially rhythm games, like guitar hero/stepmania/etc) then I could see how you might have more finger speed, but I'm not sure how much it would help.