Regarding the stage door, allow me to offer up my experience from a few years ago when he did All the Way.
I saw a Saturday evening performance, and he came out and said he had to leave so he couldn't sign, but people could take pics (of him, not with). If I recall, he did end up signing for a few people on his way to his car. I decided to return the next day after the Sunday matinee hoping for the best. For whatever reason (maybe someone said something on this board) I brought my ticket with me, which ended up being the smartest thing I could've done. When I arrived at the stage door just before the performance would've been ending, security was only letting people into the corral if they'd seen the show (there were a few hounds standing on the other side giving the guy grief) so upon presenting my ticket, I was allowed to wait.
Similar to what's been mentioned, basically anyone who wanted to stage door got inside the barricade upon exiting the theatre - they were making it clear that nothing was guaranteed, and the way they did it precedence ended up going to people who saw the show that specific day. Eventually, Cranston made his way outside and again as mentioned earlier in the thread, he exited the lobby doors and essentially the crowd came to him. It was very orderly, and people took their turn getting an autograph and photo. It was well worth the wait, and he went above and beyond taking the time to meet everyone.
All that is to say, nothing (as per usual) is guaranteed, but if he's got the time to do it he likely would do something similar - and certain days may be better than others (i.e. Sunday matinees vs. after a 2 show day) and whatever you do, keep your ticket with you in case there's a similar requirement put in place. And for the love of all that is holy, don't ask other members of the cast if he's going to come out - I've seen this happen a few times (Re: Denzel @ Iceman Cometh, Lili Taylor @ Marvin's Room) and to me it's one of the rudest things you can do at the stage door.