After we finished racing, and after a 30 minute download, I did some playing around.
There are two files that need to be addressed.
My Document\My Games\Aliens Colonial Marines\PecanGame\Config\PecanEngine.ini
and
Steam\steamapps\common\Aliens Colonial Marines\PecanGame\Config\DefaultEngine.ini
On a clean install without playing the game, the PecanEngine.ini does not exist so you only need to address the DefaultEngine.ini. The system then creates the PecanEngine.ini from the DefaultEngine.ini.
If you have already played, then both files need addressing.
I did a clean install last night, changed teather to tether and Game to game as per the information above in DefaultEngine.ini. After starting the game, the PecanEngine.ini was created and had the changes mirrored in the new file.
I played the first few scenes up to where the umbilical gets trashed after recovering the ships log and the AI seem to be more responsive, so maybe there is something in this
Samurai