Yes, we should define some patterns/phrases
Nope. People are going to start a phrase then bail.
All I care about is bagging tea.
This . . . Seems like it could backfire. I'm all for it, but then it might become as if not knowing 'sign language' makes you a n00b. Some people might get confused when someone walks over, does a little dance, spins 360 degrees, and sits down.