You forgot Docking Computers. Which should totally be something Engineers can tinker with. How about upgrading a Docking computer into an autopilot, which can keep your ship pointed at a destination while in SuperCruise and start slowing down at the appropriate time? Or a Planetary Approach Computer - pick a point on a planet surface and it makes the approach from orbit, goes through the glide process and drops you at those coordinates?
Sounds like you want the whole game to be on autopilot. Whats the point then?
Slowing down at the appropriate time can already be accomplished by setting your throttle to 75% when you have 7 seconds left to your destination.