1. I wouldn't think so. When those get set up, the facilitator can get all of them done for himself, offer them to his cabal of minions, or make a public solicitation, however he wants to do it. There has been a tremendous amount of butthurt, sturm und drang, and gnashing of teeth over the years as it relates to these, but because the facilitator has total control, you can't really complain. What was being discussed was public signings.
2. This seems to be what JDUB was intimating JB was doing, but I doubt it was mark Twain, it was probably Brian K. Vaughan.