One can use the drop command to create a small "light" object i suppose. Not sure which one would do best, but that is the way to do it. According to details in the drop[] thread, one can also specify to create the object directly on the hand.
If you wanted to make the person waive his arms in the air, an add-on is required ofcourse.
This sounds interesting to me, I'd like to see it done too.
Thanks,
Bluelikeu