I found an old email about the center pick point from Clint Rand at Forte Carbon Fiber Products. Excerpts below.
The center point pick is simply two D rings lashed to the center of the pole. Typical trip line layout is to have both trip lines tied together and routed through the top center point pick ring, however, we have also built poles with separate trip lines ending about 2/3 of the way down the pole - so there is overlap in the center. We are happy to do either, but if not specified the customer would get the former. We offer vectran bridles in place of the center point pick for $100 additional.