That would be the best... Except Power Cores are usually deep inside the ship. Maybe the Power Core would be available, but it would be very hard to destroy, because it would take firing a torpedo inside the ship, which isn't an easy task, mind you.
It would make the game less enjoyable and a lot less scientific if they suddenly stop with no gravity of friction to hold them back!!! I still don't understand how they would slow down... Oh, and on the case of gravity, shouldn't fighters be pulled towards asteroid fields?