There are no mouths that draw down at the edges in CAS. Please add one.

FlamingoKicker​ if I'm understanding what you want to do it can be achieved in CAS by clicking the corners of the mouth and pulling up or down. There's an option to enlarge the mouth too but you have to click a specific point to get the option to curve the lips. I do this with most of the lip options, even on console. Click, hold and drag to get the effect you want.