Wrong:
Nexus: The Jupiter Incident, but yes even in Nexus they don't have to move.
Do you know the word "immersion" ?
Sometimes there a things in games just to add to the immersion, but have barely a effect to the actual gameplay, but it helps many players to get more into the game, you should understand that, and even respect that.
http://www.youtube.com/watch?v=v4WXX0VXCR8&feature=related (speed up x2) Just dont asume that Nexus is a arcade game...if you do you are damn wrong.

(And just to mention in Nexus you don't have that many Ships in fight actually, it's even slow, but far more immersive and tactical than other Games.)
Sidenote, in Nexus the ships have sometimes to move because you can destroy specific Parts(devices) of the ships, and yes actually in sins it would not matter because there is no such feature, that needs more movement, i agree.
its been clearly found to be an impulse concept, "moving ships" has not been existant in any major and succesful game I'm aware of (yes that includes homeworld), it has no "realism" value, and it certainly would only make gameplay more difficult (its irritating enough as it is when cap ships go flying through heavy defenses to try and do a 180)
the idea of implementing it sounds cool, but its foolhardy in just about every respect.
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