There are places where you can have a custom made pool cue, although I'm not really sure why left or right would matter in that sort of case, because it's completely round and usually symmetrical, I would think, so that you can use it in either hand the same way. I know when I play pool with John in our basement, I sometimes switch hands to shoot, and feel no difference other than in left or right handed control of the cue.
HTH
Brenda