1. Someone with more recent experience may know better, but I think you do need to reclear security between T1A and T1B. You'll basically land in A on the domestic side, exit the airside part of the terminal, then reclear to go into B. I don't recall a walking airside connector.
2. I believe so, but I have a younger child who can't use them, so I haven't purposely looked in a while. I'm not sure that you'd wait more than 10 mins even if you can't use an e-gate.
Someone may come along with a more current answer, but that's what I think I recall.
