According to a very quick search on google, Kuszczak has save 3 out of 33 penalties in his career:
07/05/2006 - Everton v. West Brom - Penalty taken by Duncan Ferguson
17/09/2006 - Man Utd v. Arsenal - Penalty taken by Gilberto Silva
01/01/2011 - West Brom v. Man Utd - Penalty taken by Peter...
It would be a worry. I think our best chance would be subbing Brezovan on with 1 or 2 minutes left on the clock. At least he has a fairly decent penalty saving record. I cannot recall Kuszczak saving a penalty since signing for us.
In terms of penalty takers, I would trust Spanish Dave, Ward...