I think they are doing something along the same lines as this. I read something like a random duel with a mage if your magic skill is high enough. Like they would want to test themselves against you. I personly love the idea, because it would feel as if the world actually knows what your doing and not just a random npc saying thank you for closing the oblivion gates. Bounty hunters would come after you if you kill people, while towns-people would get out of your way or try to stay on your good side. Family members of those you've killed would be pissed at you, and come after you even if they didn't stand a chance.
Fallout new vegas was a start, but I found it strange that the different groups didn't interact at all with eachother. You could kill amost everyone in one town, but word wouldnt spread so you could be another towns savior. That said, I think you should be able to do that, but with more work involved. If you were known to be good in one town, some people in another town wouldn't believe you were a killer so easily. And the same for the other way around. If you were known to be a killer, you would have to work hard in another town if you wanted a good image there because people would have heard of your dark deeds in the town over.
But back to what your said, I also would like to see your choices of good or evil to play a much bigger roll, and the world around you would actually react in kind, not just say stuff to you as you walk by.