i think you should add 2 more personality traits "at peace/the peacemaker" and "the dreamer"
we can have a bed option called "lucid dreaming" so your sim can visit heaven or the hell and either makes peace with them or confront them and end things in bad terms but atleast you finished where it all have started, i think it should be a in a kind of a secret world while your sim sleeps so your energie bar gets green while the social bar also gets green so it's a win-win
but before doing that, the question pops up if you want to visit a secret world or not and if you do, you have 2 options if you want to visit heaven or hell so you can talk to your deceased sim
just like i once said: i made my own version but it's more heaven related
lot trait: comfortable (the exact opposite of mean vibe and i think they should disable that lot trait as long as the comfortable lot trait is still on)
with my ideas and your ideas combined it will be possible to have this pack as an expansion pack, i sure hope the team sees this and also sees my ideas, NOT just yours
maybe it can have the skill to study ghost skill (similair to the "Life And Death " pack but differently and a bit similair to vampire skill even without being a vampire) the more skills you get, the more option you're gonna get and maybe if the skill is completed or near completed you can click to your own sim (who got that skill) to visit the secret world without doing much effort (similair to spellcasters but differently)
with the latter i just came up with it