Maybe SwC could somehow have the server write the seeds used for a hand to the hand history, after it is played? That seems like it's asking for trouble though, if someone managed to get into their server and intercept the hand seed output before a hand has finished.
AFAIK, the problem is that if someone folds a hand, the cards should never be shown to any 3rd person.. If the seed is revealed, all players hands are shown. Is it so?