FOV ...
Scale pitch sensitivity for mouse (mouse y delta) and the keyboard pitchspeed by multiplying it by fov_y/90.
Scale yaw sensitivity for mouse (mouse x delta) and the keyboard yawspeed by multiplying it by fov_x/90.
Or is this wrong to do? Because it ties input speed to the video mode (since fov_y is calculated in a way that depends on the aspect ratio).
Or maybe just do it for FOV < 90 (so that unreasonably small fov get scaled, but fov that someone might actually use like 90-120 are unaffected). And only use fov_x/90 for the multipler for both to keep the video mode out of the equation (I mean wouldn't it suck to have a nice setup just to find that if you changed to a video mode with a slightly different aspect ratio it messed with your aim).