Ultimately harnesses shouldn't be used without a cage, or at least a hoop, at least then you have a proper mounting position for the harness (there are pretty strict guidelines by CAMS on this) and if you were to roll you wouldn't be stuck in one spot as the roof comes folding in. I'm not even sure if CAMS would let you mount your belts so far back...It's been a while since I've had to consult one of manuals, but it seems stupid. The whole point of the harness shoulder straps are to be short, because the longer they are, the more stretch and give there is, so they are deemed useless. IMO you either do things properly and fully or you don't bother at all.