I've often incorporated the 1.00 already showing in the AS snipe page window by simply adding a number before or after it: 31.00; 19.00 and so forth. The decimal has always been constant for me, that is, I never have a bid of 3100 or 1900 placed by AS.
Ya, you can withdraw a bid of $5100 you meant to be $51.00, but don't do it too often. You don't want a track record of withdrawing bids.