Oh hey... something I forgot to add regarding the bags for the Crown of Stars. I think if you mark them owned, NPCs will leave them alone. JQ Assassin Quest does this with its reward bags - not sure why, but it might be for that reason. I know they don't go randomly activating containers in the cities if you use Better Cities (BC marks them all as owned). Course, the gems will then be considered stolen, but since they technically
are stolen anyway... and really, I could see some merchant looking at them and say "Oh, no, I'm not buying that!"

It would add a small element of verisimilitude to the quest if you want to keep them for yourself and sell them.