You are absolutely rigth, daygobah. If physics would be the only concern, ED space ships should zip around with thousands of m/s (at least after enough time to accelerate), meet for fractions of seconds, exchange some deadly blasts and then take hours to eat up their momentum and turn around.
This, while modeling space physics correctly, would be terrible game-play. Hence FD implemented some artificial restrictions. The ship's fligth assistance counteracts inerta with active thrusting in the oposite direction. This is why you stop turning, if you don't stir actively in one direction or come to a halt, whenas soon as you stop thrusting forward.
This doesn't happen if you use 'flight assist OFF': Without active counteraction, you will keep your movement forever. But even in this mode, FD implemented a maximum speed. This is an absolutely artificial limit and is not based on any law of physics. However, it is necessary to grant enjoyable dogfighting. The gaming experience trumps realism in this case.
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Oh well... multi-ninjad!
