I just did a bit more research and it looks like Vehicle Dynamic Control (VDC), Hill Start Assist (HSA) and Hill Descent Control (HDC) are *not* part of the NISMO package. The brochures, etc. are a bit misleading about this, however. There is an optional 'NISMO Traction Package', which adds these two features. Apparently my NISMO 4x4 Crew Cab did not include this extra package.
--Ben