Since engine start up and shut down is confirmed, I thought it would be a good idea to have the hydraulic system included within that procedure. Usually when an aircraft is shut down, the hydraulic system goes out as well, causing the rudder/ailerons to move away from their neutral position (due to wind). This is an interesting feature that would look amazing for parked aircraft, adding that extra bit of realism. It can also tie in with FDS’s live weather system.
Heres a photo I took of a Boeing 777 showing this phenomenon.
Video explaining (Captain Joe does a way better job explaining it than I do):