Well, this wouldn't "save the game" for me personally.
But, it's something that has always irritated me about TS4. I tend to not have my sims travel to worlds that seem like they are not close, if they travel at all. I set up each world with no pre-mades, they're all my sims I've placed, I also have over 300 of my sims in the not in world bin, so I have plenty of player created sims to fill those roles without the game doing it. And, I've always wanted just my sims to be the visitors on community lots in my world and the walk-bys/joggers, etc.
I don't understand the dev team's thinking process of allowing all sims to freely go to all worlds. In my RL, I can assure you if I go to another city (or state) for dinner, shopping, a concert, or vacation, I will 99.99999% NOT see people from my own city also in that other city, at that restaurant, in that motel, at that particular mall or social event at the same time I am there. (Unless there's some spectacular event that is going on at that time, then I might see 1 person I know.)
I use a mod for this.
