Your clients have decided not to move forward? So they are going to do what? Just curious to read your post. Normally for a lender to agree to a short sale there is hardship and the sellers are supposed to be insolvent. So asking a seller to sign a promissory note, usually unsecured and interest free, is one option. It does offer a way for sellers to rebuild their credit.
I am curious to see what posts you receive from anyone having info about B of A short sales too.