I've never had it marked on the ADR. I have, in the past, just mentioned it to the CM when we checked in. We used to do that for character meals. I'd let them know ahead of time that they couldn't "sneak" up on our DS. They were always really good about it. Nowadays my DS is comfortable w/ the environment and likes being surprised by characters. At all other places if DS gets too fussy we take him out for a break.