In Oblivion I always liked to make a stealth character and enjoyed sneaking around dungeons on missions as if I was playing a stealth game. It would be much better, especially at an earlier level when sneak is low, if we could approach certain light sources and put them out. For example, if a guard is on a set patrol path and I want to steal something in the light, I could put out the torch or candle while he's not looking and take it and still be hidden in the dark when he turns around. It would also raise their new suspicion levels if they see lights that were lit being put out when they come back, and when they move in to investigate you'll have already crept away before they can relight it or just take em out.
I was thinking it could work like how it's done in the "Thief" game series. http://www.youtube.com/watch?v=xcNeaButEWg&feature=fvst
Not with "water arrows" of course, but maybe using regular arrows to take out some candles or small torches that are lighting up a hallway or corridor.
Let me know what you think.