jamie... i think u might be referring to the def positioning setting (0, +1, -1, etc.). this setting is for playing against different styles of offense, for example, when u look at the opposing teams lineup and u see that they launch a ton of threes (guys who shoot 3pt% @ 40% or better... rice, nash, murphy, barros, etc) and the big men are maybe guys who dont score much, russell, mutombo etc, owners will set their def positioning at +1, +2 etc to guard the perimeter. same can be said with a team whose big men score and guards who dont shoot lots of 3's... wade, frazier etc.
balanced teams are usually set at 0. hope this is what u were looking for.