As I understand this the rules impact the fact that the boat is equiped with wings. If your Dad chooses not to use the wings to hike out further, that's his call. But he will still be rated for having them on the boat.
Now there is a reasonable argument. Thank you. But it is not a leverage advantage vs. a second trap.
The H16 trapseat actually rates higher than stock, but the helmsman is supposed to stay in one seat for the race.