I'm right handed, but have learned using left hand when I work at the computer. This is so I can play with right hand and work with left hand without them being interfered due to
physical injuries that may occur over longer sessions. I use a
Logitech G300 at work so I and others may switch hand whenever we want. I do recommend to learn using a mouse in the left hand. Took me only a couple of months to get used to it and I think it was worth.
Other than that, I think I'm not going to unite as I'm not lefthanded in general.