Hmmm, not sure where you are going with this unless I can be on the other end of the equation - JJ pitching a complete game shutout, that last swing would be worth a bunch :)
The simple answer is 7. Batter gets credit for a bases clearing triple but on the throw to third the ball goes into the dugout and he scores a run. No pitches just pure points.
First of all, I did mention something about a "trick" to the question. Also, I gave a hint that the 3 runners were "teammates". This means that the 3 runners, as well as the batter are all on your team. This would make a grand slam worth 10 points.
With the game situation being 2 outs, bottom of the 9th, the score 0-0, the grand slam would end the game with a 4-0 score. Your SP went 9 innings for the winning team, so you get the W, CG, and SO with the win brought on by the grand slam.
Total change by one swing of the bat would be 20 points.