State saving
You can have buttons state, levers positions remembered when you recall your plane (start a new flight, or restart your current flight)
State is saved every few seconds
Activation
Use the option in the book to activate state saving.
You can also force cold and dark state
If you start (or restart) from parking, everything will be restored after a few seconds
If you start from runway or in the air, you obviously won't have updates on controls, only visors, windows, lights.
Not implemented (yet?)
Magnetos are not synchronised (by choice). Consider you still have to take your key, even in the plane you left like this