Wouldn't it be cool to just sit down on the grass in the pine forest, and look at the stars? Nearly all MMOs allow you to sit, I don't see why single player games don't do it. seems easy enough to implement.
One difficulty might be the shortage of controls. I can't see them putting a whole "emote" menu option on a console controller button. (Plus, having to do it through menus would be pretty awkward).
Yeah, you can sit on chairs & benches.... but that's just "activating" the furniture object with the Use command. Not really something you can target at any random patch of ground.
edit
Oblivion had a nice mod that allowed you to put a small cushion anywhere, and it would act like a chair.
Yeah, that would be one way to do it. Drop an object that you could then Use.