Are they aware that the brake system needs to be kept in tip top shape and well adjusted now?
That's actually nothing new but the reduced stroke of the master cylinder is and now less room for error.
I'd be real hesitant to make such a modification to the brake system for someone else, and I'd still think real hard about the consequences if done on my own vehicle.
I understand this solved a problem and sounds like a real good thing, but it could also be bad.