I'm using Jordi's hack too, and in conjunction with the "imaginary" new cheats from Pets that MaxoidSam told me aren't there (uintProp   maxTotalSims # uintProp   maxTotalHumans # and uintProp   maxTotalPets # ) I can do anything I want when it comes to how many Sims are in a household. 
Jordi's MTS2 site suggests the following figures:
    uintProp maxTotalSims 50
    uintProp maxTotalHumans 35
    uintProp maxTotalPets 15 
Just a momentary doubt - are these per lot figures or neighbourhood total figures?
sannu