ahm... just to your info: this is exactly what the static mesh support in a7 is supposed to do. so if you wait some months, you#ll get it with a7.

the greatest disadvantage would be that the shadows are only baked, move the chair in franks example and the scene will look odd. so this metod would only be good for an unchanging lighting situation in combination with immovable objects. rather limited, if you ask me.