Would be pretty cool to have the Power Transfer Unit (PTU) sound added to the Airbus aircraft.
It is the power drill sound that you hear after pushing back.
After pressing “STOP PUSHBACK” or “Brake” (only if pushing back), the sound of the PTU would go off. This update could come out whenever the devs push an engine sound update later in the future or whenever.
Video (not mine): https://youtu.be/aqV6WZNBhtM