You mentioned UI cheats. Well, MCC allows the player to choose an emotion that last 24 hours. The documentation says only 2 hours but from my experience the moods last a lot longer. “Change Sim Mood" found under cheats in the menu never seem to end when I apply them in my game. I do know that objects auras can override the cheat but as soon as my Sim move away from the object the applied moods comes back. You can choose which modules to place in your game. You don't have to add all of them. It's just a shift click in game to change a mood of any Sim. I know you said without mods but MCC is just a script mod that works similar to in game cheats without the constant typing of cheats codes. You can set it anyway you choose. It's has options. You can exit the game and go play again without reapplying the cheats.
