So, if a Mortgage Consultant said, no, the answer is still the same, no until you have those years.
I read between two to five years.Also, is important that your credit is in good shape. With a short Sale most probably your credit score got hit down, so now you need to prove that you really know how to manage your credit and the short Sale was only a one time event.
Having a co-signer won't change your wait because both parties have to be able to qualify for the loan and as the person who went through a short sale you need the time to rebuild your credit scores and wait the 2-3 years as mandated by the guidelines.
A really good lender can answer all your questions and if you don't currently have one, let me know and I can give you the names and contact information of a couple who will take the time to explain it all and put you on the path to repair your credit and qualify for a loan in the shortest time possible.
Hope this helps...