Yes, the PIN stays when you power down; it’s a “always enter the PIN/never enter the PIN” type operation. Like setting password protection on your computer.
About your troll filter, great; use one if it makes it better for you. My comment was that your HUGE BOLDED replies to things you cannot see was quite childish, like sticking fingers in your ears and saying “nyah nyah I can’t hear you!”
Like I said before. sometimes it takes extra effort to get certain concepts, like "i have no interest whatsoever in discussing anything with trolls" through their thick head. Eventually they give up when it ceases to be entertaining to them. It's a shame that the moderators have abandoned their responsibilities in this respect.