Tread lightly, so many factors to consider... Does Seller have a hardship? Does Seller have more than 1 mortgage and/or lines of credit? Does the listing agent know how to communicate with the bank(s)? Is Buyer in it for the long haul (if you are considering ss and you accept an offer, get the buyer to agree to giving your broker earnest $ before bank approval, buyer is more "in the game" and less likely to get shifty every time the wind blows)
I don't list shorts, but refer them to a fellow rockstar agent. Let me know if you want more info.