AS won't let you set up two snipes, but you can put in one (or more) previous proxy bids manually. We recommend against this because it's tipping your hand and defeating your purpose as a sniper -- which is all about stealth and surprise.
Don't worry about your AS snipe getting in on time. It's programmed to add a few seconds to your snipe automatically if it senses that eBay is running slow. (So don't get your knickers in a knot if your bid goes in sooner than you had it scheduled for. That's just AS trying like mad to make sure that eBay accepts your bid even though the eBay servers are busy.)
No, neither Rick nor I is an administrator. Just longtime snipers, like you'll be one day.