I already reported this, but I thought it may interest some people wich encountered the same problem.
I rebinded the Jump/Boost mapping to the SHIFT key. When the ship is strafing to the side using thrusters while the boost is activated, the game will not recognize the release of the strafing key, continue strafing, and therefore disable the inertial dampeners.
It stops as soon the strafing key is pressed and released again.
Controls should behave the same way, regardless of the key binding.
To reproduce:
1. Set Jump/Boost to SHIFT
2. Strafe the Ship by pressing and holding A or D.
3. Start boosting by pressing and holding first SHIFT, then W while holding the strating key at the same time. There should be three keys pressed right now.
4. Release the strafing key (A or D)
5. Release SHIFT. The Ship continues to strafe, inertial dampeners stay disabled.