I have to disagree. If he didn't mind he likely would not have mentioned it. The way I read it is that he would prefer people to ask if they can record him before blatantly doing so. His follow up is that he would still tell you no, but that he appreciates being asked. Taking photos is one thing but videotaping is just invasive.
All of the cast seem to be hit or miss, so if you are looking for someone specific, I wouldn't have hopes too high. I have never seen Caissie Levy, Sam Hill or Keala Settle at the SD, Clif Saunders seams to be pretty consistent. I never had luck with Will Swenson but Adam Monley (current Javert till Carpenter) seems to be pretty good. Nikki didn't come out after the matinee I saw but did come out after the night show. Andy I never caught but I know others have had success with him. Ramin is also hit or miss, ironically I caught him post a Sat matinee after trying night shows for awhile. He always seems to do the SD after the Sunday show so if you are looking for him, perhaps thats a good try.