You are mis-interpreting something written in a way that is not in the rules. Please see the diagrams. The finish timers must ALWAYS be hooked, by wire to the finish. The two timers at finish you refer to in that sentence are connected directly to the finish.
The "Any" refers to any method to send start times from the start to the finish as in a skier skiing down start time, a radio sending down start TODs, a wireless transmission device such as a TED sending impulses OR data, or "Any" other way you can think of. This does not mean you can add a timer, as this timer would not be part of your system A or System B. If you are taking times from a 5th timer that then become official, that would be system A and it would need to be connected as per the rules via a wire to the finish photocell A.
You seem to not like my answers regarding ski racing and "Timing without Wire". I am providing this input as a timing professional, FIS TD and the Vice Chair of USSA's Timing Working Group. If you don't like my answer, please feel free to contact either of the North American representatives to the FIS Timing Working Group, Ted Savage or Allen Church.
You can always choose to time any race, any way you wish, I certainly can't stop you, or actually do anything about it. I can only educate you on the proper way, and recommend to the USSA Classification Committee to not score a race that was not properly timed. I have no doubt the TD at a FIS race would ensure timing is completed as prescribed by the FIS rules, but the same could be done with scoring of the race and the FIS Classification Committee. This may never be an issue, but it would be a shame for all of the athletes entered if there were a problem or dispute over timing and the race not to get scored.
Jenna