the ability to drag bodies around would make big sense. i dont see why there should have been problems implementing it into the game - many others have done it before (i.e. thief, hitman, splinter cell). of course, thats just a technical aspect, i dont know about the general design of the game, for many things have to be considered, like AI response for bodies ecetera ...
i like to play stealthy chars, so that would a big plus for me
however, the screen, from my view, doesnt actually look like as he is picking up the body. the "just checking the body" theory works better for me