Undo/Takeback

Have Chess.com considered adding a button for undo or take back.  In several games I was using my laptop and the piece falls from the mouse before I get to the intendded spot.  It cost me the game each time.  Perhaps there should be a 5 second delay before the piece is accepted in a square.

When you factor in my arthorghtist, this places me at a great disadvantage.

Have other players complained about this?  Is it possible for a skilled computer person to cause the pieces to drop from the opponents mouse?