I had a long talk on this subject with Wendy in 2005 or 2006 (she's now moved on to another part of the National Park Service). She said that Pinnacles staff were OK with climbing EXISTING ROUTES over trails if it was done ON WEEKDAYS and WITH DISCRETION. Sorry to "shout," but I wanted to capitalize the terms that were critical to her. Basically it was all about not creating any danger for innocent, non-climbers. And, yes, as we discussed it, this applies to Park Service maintained hiking trails, not to climber approach trails.
I put this informaiton in the two entries at the top of page 21, although they are there without a lot of explanation (is a lot of explanation of the two entries even needed?).
I'd love to hear from Gavin on this subject. I've got to get back to work. One of us should email him a link to this thread. He could give us their current views (which I doubt have changed).