There already are outcomes affected by (a single) rest, are you aware of that?
How many are there? I know of a few, and I might have missed some, too!
If you get close enough to spawn that dying True Soul and his two dimwit acolytes but don't interact with them, a long rest will result in the acolytes moving to the goblin camp and leaving his dead corpse lying there. They'll be hanging out at the courtyard party.
A similar thing can happen with Ethel and the brothers if you don't step in. She'll leave their corpses behind and head to her house.
