The maf has to be plugged in as it is the reference to IAT. This is not a hack or similar - it is simply a Speed Density style rom. The maf itself is simply just not used in referencing anything in the ecu.
meaning you could run a 10" intake with 50 90*'s and the maf installed - it would hardly read any voltage but the iat would work and that is all that matters..
Speed density doesn't care about the maf - just the map sensor..