A brake force regulator actually has nothing to do with how much goods you are carrying in your trunk.
It is used to balance a brake force between front and rear axle. For example, when you are braking hard, a rear axle became very unloaded so there is an excessive brake force, wchich is delivered, where it needed moost - on the front.

Anyway this regulator is dropped by the factory from the later Audi with same brake system so it seems that there will be no negative consequences throwing out this thing, also some of the V8 owners noticed better braking, after doing this kind a procedure.