Oh, as soon as you mentioned using the jump wire as a jackline for safety harnesses, I knew you had to be correct bracco. It's perfectly logical that with a man trying to go forward on a narrow, pitching deck only a meter or so above the water, with waves several meters high washing over, that of course they'd clip onto the jump wire.
In fact, it seems to me that at least when they're on the bow, the rise of the wire would lift them out of the water and deposit them on deck as the boat's motion dragged them aft towards the height of the CT.
The only thing is that they likely wouldn't be able to reach high enough to clip on until they were at the forward end of the side railing, so a dangerous trip to there.