Starship agility

In _Starship_Operator's_Manual_, there is an extended description of the
gyroscopic system used to control a ship's heading.  It seems that everyone
has been assuming the extra power used for agility goes to the thruster plates.
Perhaps it goes to this gyroscopic system.  Agility, then, would be properly
a measure of a ship's ability to change heading, rather than direction.

If this is the case, then, I suppose, changing direction of movement, for the
purposes of navigation, would only be a matter of thrusters; agility would be
irrelevant.  Agility would become important in combat, however, in aiming
spinal mount weapons, and in making extremely rapid direction changes, as in
dodging missiles.

But I'm no physicist, so, having suggested this, I'll leave it to those of you
who are.

Brian G. Vaughan