Actually, I think that would be totally inappropriate for ESF, or any other DBZ game. I know if I see two other players, standing a few feet away from each other circling around, I'm going to use a beam on them. Twin hit is just too tempting.
And Oni wasn't that good a game..it was just okay.
oni was based on the ground, in fairly enclosed areas. Im thinkin that tryin to port that to dbz (although savior of strength is attempting to create a similair system from what ive heard, but thats a diff matter) is a bad thing. You would def need a lock on, and tryin to stay within punching distance of a moving opponent would be next to impossible (for mulitple hits anyways)