If you don't know, the "unstable" trait was a trait in the Sims 3 that made it so your sim could essentially have a mental health crisis, which could lead to their other personality traits permanently changing...how hard would it be to make this in TS4? I have no modding experience but am trying to learn...judging by the fact that there aren't any mods of it leads me to believe it might be "extremely difficult" or "impossible", but it doesn't hurt to ask