Not really - its cause the mass is centered around the hpmount i think - not positive - so it can "pivot" or act like a pivot around that point. Longer the ship = less force to spin it.

Ok, take a look at the code included in the Battleship mod (the one packaged in FLMM). In there there should be a couple of lines that look like this:
<pre><font size=1 face=Courier>steering_torque = 250000000.000000, 250000000.000000, 250000000.000000
rotation_inertia = 2540999936.000000, 25806999552.000000, 638700032.000000
angular_drag = 4000000000.000000, 4000000000.000000, 4000000000.000000 </font></pre>
copy these under your ship in your shiparch file and you shouldn't have a problem.

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