uberlinuxguy
commented
10 years ago I took a quick look at this, it looks like the file inp_user.cpp is where you might want to play with this. The functions User_ShipYaw(), User_ShipPitch() and User_ShipRoll() look like they may be a useful place to start. I'm more or less making a note of this for myself so that I know where to look again but also if someone else wants to look at it they can start there too.
The game currently treats keyboard input as binary when turning a ship - it's either max turnrate or nothing. This means that the game's keyboard turnrate can either be slow-and-accurate or fast-but-inaccurate, but not both.
Adding an acceleration curve to keyboard turn speed based on time since the key was pressed would make the game much more playable on keyboards.