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Previously, NBC 4.1.8.11 ( b) for minimum seismic base shear V was the base shear based on S(T = 2.0), and applied to all structures. Now, the requirement for walls is shearwalls is 4.1.8.11 ( a) , the minimum shear based on S(T = 4.0). As the program has no input for S(T = 4.0), and elsewhere in the program, we assume periods are not greater than T= 0.5 based on the height of the structure, we have dropped the minimum base shear as not applying to wood structures. You could conceivably enter a large enough period that the minimum is achieved, but that would not represent a realistic structure.