No. saddle position has nothing to do with reach. saddle position is for placing your pelvis in the ideal position for your pedal stroke. most people go by KOPS (knee over pedal spindle), where you position your saddle such that your knee is directly over your pedal spindle when the cranks and feet are level. some people like their seat a little behind the KOPS position, or perhaps in front, but either way, it's a good place to start.
if you are trying to make up for a bike that is too short by putting a seatpost with more offset on it, you are going to fuck up your pedal stroke and eventually hurt your knees. I know this from personal experience. if your reach on your bike is too short, you need a bigger frame, longer stem or different handlebar or some combination of the two.