Since I have never owned any rudder hardware, and use the saitek yoke and throttles, I have always left autorudder selected in the fsx menu, I have heard that this interferes with the NGXs' yaw damper. Any ideas on this?

Did'nt think so as I have no handling issues with the aircraft. Thanks Jason.

Most probably you should leave this option unchecked when you plan to use a jet with a yaw damper. At least, you will have the ability to enjoy realistic flying when you have a failure in the yaw damper (a twisting stick will do the job). Problems of interfering with yaw damper might make sense, but I have not experienced anything unless I turn off the yaw damper to see how the airplane behaves.