Ok two things 1 why dont they make the AI more responsive to the sight of an unknown dead body or a fallen ally. They should regroup, warriors defend mages/archers while Their rogue repositions for an ambush/ runs away forever if cowardly
2 i think you should be able to sneak up on the guy chillin furthest from the fire, backstab then grab/catch his body and Easily drag or pull him into the bushes it would be perfect.

I agree that bodies should be 'lighter' and easier to carry as apparently I'm on Riften corpse duty and have to drag dead thieves and guards around all the time.

I'm sure at some point there will be a stealth revamp mod that will turn Skyrim into MGS or Splinter Cell. And I'll certainly install it.