How do I stop the game from generating townies?

I'm using Zero's walkby overhaul.

My problem isn't that the game is generating (ugly) townies but that I have the townies in my game, in unplayed households and the game just isn't picking them for the jobs.

But the recommendation about a second tray file is really helpful, thank you.

I'm going to try removing walkby overhaul since that may be stopping the sims from being picked for the roles.