Let me also put my vote behind this feature. It would be great to see service vehicles and jetways detach at the press of a button in the GSX menu, the "overnight stop", as this topic named it.
An "airport editor" might also go along with it well. Once the jetways and service vehicles are detached, instead of just disapearing, they might go to selected points you set in the "airport editor". Following predefined routes on the afcad, or the taxiway lines until they reach their resting points.