I've looked at MCCC too but never found anything about the "let me out" automonous action. Also I knew about the locked door thing and that they just pop out of the chair, but like you said, that isn't what I want. You can also shift click and click "reset sim" but that's not what I want either. And turning the in game option of "autonomy off" doesn't help as the toddler STILL calls for an adult after a certain amount of time. I really really hope some mod creator could provide a fix for this. And I'm glad there's someone else that feels the same way I do!