I'll be more happy, if the spaceship engines would more realistic according to these points:
The engines must placed balanced on the ship, like the thrusters. So if they're not balanced around the centre of mass, it would make a rotation around that (but isn't usable as stronger thrusters, because you can use that only with the W key, and the thruster-system doesn't calculate on this (as now))
The engines require fuel, what are available on all station cheaply. But you consume fuel only for acceleration (standard and FTL). This would bring the game more realistic. (The energy consumption matter furthermore, but it will mean not the driving-power but the small fly-modifactions, what the player doesn't see)
What are your opinion? :)