I made the bad decision during my replay of The Witcher and killed the people trying to get Haren's stuff after killing the Drowners. Is it possible to change this with the editor? I'd like to have the people I killed alive and I'm almost near the end of this part (just have to kill the beast).

EDIT: In the end, decided to load a save file before the quest and do everything over. Now I'm already in the second Chapter. From what I'm gathering, changing which quest you've done isn't possible, even with the editor. I'll have to be careful with my choices from now on.