Hand swipes on sw simulations

Has anyone come up with a good way to simulate hand swipes on software simulation project?

I would like to actually simulate using a hand graphic to do the swipe.  I get how to do the motion path, but I haven't decided whether a transparent hand is a good way to go or an illustrated one.  It would be nice for Captivate to add this to their features.

Just curious how others have done this.