I agree with this, it would be a great idea, however the scope of the idea would be a rather large one, because, if you are flying around on a planet, wouldn't the gravitation field strength also have to be taken into account? (because of relative weight and mass of the ship ALONG with the weight and mass of any players on board(super nerd, ikr))
This would mean that there would have to be a way for the game to recognise how many players are onboard a single ship, calculate their weight and masses (if they aren't all the same) and then do g-force calculations for a SINGLE ship. An I'm guessing there would be a lot of ships about.
Unless I'm missing something really obvious, I think something like this would be a real strain on a server, especially as the devs are advertising it as "one big server".