The value for yaw moment of intertia that you enter in the Vehicle Inertias dialog is the value about the vehicle's center of gravity, as expected.  EDSVS is based on a model developed at the University of Michigan, TBST.  In this model, the yaw moment of inertia is resolved about the geometric center of the vehicle.  EDSVS uses the same logic.  As for all variables, the value given in the output report is the value actually used by the program.