Alright, so I just had another idea I thought would be pretty good.
End of the main quest, have a video that plays. No one does this for any quests beyond the original MW(that I have seen; heck, not even Oblivion really had video). This would make it a great addition; heck could make a couple different ones if theres someone who can do it and given that there are tons of amatuer video artists out there I am absolutely sure that we could find one at some point.
As for what I have in mind, obviously it would be up for change.
I think it would start with showing Thadas falling over from the final blow to him in a somewhat dramatic manner. He is then laying there near death explaining the basics of how he is now free or he now sees how wrong he was or something like that(I have said that him saying to the player that he knows he must die is not realistic, saying it after he is already dieing makes alot more sense as he now regrets it because he is dying) Perhaps he could mention how when the player was working with him he felt some certain way or something. He then passes and lets out his last breath and the video fades to white really quick. The dialogue would have to be very good and maybe I have unrealistic expectations for it, but aiming high is nice. All this happens while suitable background music is playing.
As a suggestion for this music, get this chick here to use her voice if possible: http://www.youtube.com/watch?v=xxE5R6uA ... re=related
Everyone loves her voice and she actually does videos on youtube. If not that, sad violin is nice too.