There IS no resistance in space, acceleration would just change based on mas/thrust ration like it does now, however if you want realistic turn the PHYSICS_LINEAR_DAMPING setting all the way to 0 so that there is no resistance, and if you bump a ship it\'ll keep moving forever... since that\'s what would happen in space. I like it that way to a certain extent, with it at 0 it\'s realistic, but if you bump a ship, or jump out of a moving one, its pretty much gone forever. 0.01 is pretty good. In space the shape of a ship honestly wouldn\'t matter, my sisters friend looked at my game and saw a block ship, he shouted \"wow a game where in space they don\'t build aerodynamic ships! finally! its realistic. I don\'t get why in movies and things they have aerodynamic ships in space, it isn\'t a very efficient use of materials.\" or something along those lines. He is a very practical person and has taken I think 8 years of college and taken classes on just about everything.
In space (learned this in Aerospace) a flashlight could propel you through space. it would be VERY slow acceleration, but it would get you going fast in years. The light pushed on the flashlight, and would make you move. The reason I mention this, is that if you are going fast, you should be able to take your finger off the thrust and keep going that speed. I know this is unreasonable for a game, but its realistic.
That in mind, My own twist on this. Have it so while your in a ship there is no damping, but if your not in it there is. This way while your in a ship you can take your hand off the thrust and keep moving, but use shift to stop. But if you jump out, or bump something, you don\'t loose it forever. Makes it semi realistic, but still reasonable.