[12 piece bucket]

I know that Mr. Kelly recommended "strong single action" for hitters and swingers but I have read in other posts that some use a traditionally strong left hand grip for hitting. What do most hitters use?

And another question that logically follows the previous question. Do you take the club away so that the face of the club remains square to the target (feels closed) or do you allow some roll or fanning of the right arm?

Yes . . . all of those are OPTIONS. You just gotta figure out what works and the implications/construction of the other components.