He must be great to have around as a creative consultant, he is the guy who created this universe in the first place, so he is the one you're turning to whenever you have any questions regarding what works and what is not in the SW-universe - he's the expert. You cannot do anything silly like putting jetpacks on Artoo for example, as it breaks the in-universe rules established by the previous films. Those sort of things.
Lol. Awesome !