Unfortunately, you can not work after 9/30/2012.
This answer is of a general nature and should not be relied upon as final, nor is it intended as legal advice. Consult with a qualified attorney before making any legal decisions. Gen Kimura, (832) 247-6932.
You are permitted to stay until a decision is made, but Cap Gap only covers the time until September 30, 2012, therefore you cannot work past that date. Consider asking your employer to file premium processing to get adjudication within 15 days.
DC Metro Immigration Law PLLC, Arlington, VA (202) 470-1004 provides the above for information purposes only and does not construe or intend to provide any legal advise or an attorney-client relationship. You should contact an attorney to discuss your personal circumstances and for legal advice.