Without training, the average human can withstand 15-20 Gs for a few minutes without experiencing any ill effects (aside from nausea and such, obviously).
That's horizontal Gs, by the way. Pure vertical force, you're looking at a max of 3-5 Gs before gray- and black-outs.
Considering that the only people who need a firmware other than the one that Sony provides are the pirates, I'd say this is well within the confines of legality.
Don't go to a communist country that claims to be a republic, to see fixed or otherwise gimped events that claim to be sports.
SPOILERS: Russia wins gymnastics, Kenya wins distance running.