I love the Thief games... but what is the point of knocking someone out in Skyrim? I mean it might look neat... but would there be any gameplay implications?
In the thief games, knocking someone out(rather than killing) made for a quieter, more stealthy kill so you would not be easily noticed by nearby enemies. Also, unconscious enemies could be revived by their comrades if they were found.
In Skyrim, I don't think the stealth system will be nearly as well-developed or important/central to the gameplay. I just don't think Skyrim is meant to be much of a stealth action game along the lines of Thief or Splinter Cell.
Considering theres the Thieves Guild,wich imo its directed to players that like those kind of games like myself, i think it would be a nice thing to have,imagine a mission where you had to break in a castle to steal a artifact and you could knock out the guards on your way to it,we can already drag bodies,we would have to drag them out of sight so they couldn't be revived by other npc's,i think any player that enjoys the thieve guild would enjoy something of the sort.