I don't think so. The facial expression issue is probably just part of the AS package.
Sometimes I have the same problem. Smiling at customers at the drive-through window feels weird. I think I manage to do it briefly, then look down to take their money, then repeat when giving back their change (if any). Thankfully, no one's complained--I don't think they really care as long as their order is correct.
In other situations, I'm probably making the wrong facial expression and/or it looks forced--maybe that's why some people have given me odd looks.
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The existence of the leader who is wise
is barely known to those he leads.
He acts without unnecessary speech,
so that the people say,
'It happened of its own accord.' -Tao Te Ching, Verse 17