The suggestion is made for realism, but it's a game that isn't meant to mimic real life movements flawlessly. Especially in the early ages of the game, most replay makers were 1/2 as good (maybe even less) as the ones now a days. It players a long time to figure out how to move about even semi-realistically. I'd say instead of describing replay makers motions as "realistic", "fluid" would be a better way to describe it.

And if you added the additional joints, it would really be a gamebreaker and cause way more problems rather than improving the game. The only way I could see this working at all is if it was somehow implemented as a different "game mode" so to say. Like certain mods would have the rotational joints in them, and the current ones wouldn't. That way seasoned players aren't forced into basically having to learn an entirely new game. So it'd be more of an addition rather than a change.

Anyway, it would be wayyy to mucch of a hassle to even implement this.

Didn't research anything about the physics engine, but from what skul said I don't think it will work.