I have never seen a game do this before, generally standard for mode difficulties. But I have seen mods that do the things your wishing for. Before they went into all that variation besides the normal modes of difficulty, I am sure a lot of people would prefer some other things accomplished in regards to the games development. There is only so much variation a game developer can justify for a game, I think that is the main difference between tabletop and video game. It is easy for a DM to make changes like that, but to do that same thing in a game, is a crapload of code.
Dont take to too litteraly ...
That was just example, i simply hope we will be able to adjust our game experience a little more precise than just "easy / normal / hard" that is all.
Even if that would mean at least separate combat and social interactions. :-/
