It's "short sale," not "quick sale."
Check with your Realtor. Honestly, lots of people don't. But recognize that your lender has two separate tracks: One for short sales and one for foreclosures. If you stop paying your mortgage, then your lender might foreclose on you . . . even if you have a short sale pending. And to clarify--short sales often can take a long, long time. So if you stopped paying, you might find that 6 months from now, while the short sale is still pending, the bank forecloses.
Again, check with your Realtor.