The hidden "maxAcceleration" property is different for different parts containing gyroscopes (0 for the capsule prefabs, 1 for gyroscope part and command disk aswell as for the new craft capsule).
This significantly changes the behaviour of the craft, since a value of greater than 0 for "maxAcceleration" entirely bypassed the spool time of the gyros making them respond to inputs instantly.
Alternatively for the capsules where the value is set to 0 the gyros take time to spool up.
This becomes especially noticable when trying to tune the autopilot pid, as with the spool time it gets a lot more difficult to get a desirable reaction as the craft over-/undershoots the target heading in weird ways due to the added input delay.