Add and remove sentiments

I totally agree! My problem is that there are some sentiments that my sims would have if they had been introduced to the game earlier, and I'd love to add them to my sims now. I once had a mother save her child from freezing to death by pleading to the grim reaper. If sentiments had existed when this happened, they would each have positive sentiments towards each other, but as it was a few weeks before their introduction, it's as if it never happened now that the moodlets have gone. I really hope a cheat comes out so I can add these sentiments!