I fixed an issue with the torque physics that would cause excess jittering with the vehicle. This would most likely be noticeable when trying to redock with the command module. The amount of jittering due to trying to control the vehicle is almost non-existent now.
As a side effect of this bug fix, the retro RCS thrusters (and possibly the main engine) are now far more effective than they were before.
This issue is not related to any jittering that you may experience in the later levels of the game. That is caused by the Unity engine using 32-bit physics and the planets late in the game being so much larger than the early planets. The 32-bit physics is also why I scaled the planets and vehicles the way I did.