It seems that abilty to add sims in caw, is in the engine, I'm just wondering why they did not add the option, before I show the pic., don't get to excited, none of this is tested, at this point, not even sure If the sims actual work, they have no proper address etc and the game views them like a game object. But it does read them in the cache like a sim, so it's looking good on that point.
I will test them out first to see if I get them sims to work, if they do work a tutorial will follow.