Is it possible to adjust the mouse sensitivity in the PC version of XCOM: Enemy Unknown?
Apparently yes, but for some reason there's no UI for this.
Go to the Steam folder (usually
C:\Program Files (x86)\Steam\SteamApps\common\), and then navigate down to
BaseInput.ini in your favourite text editor and adjust the
MouseSensitivity value to whatever you find most comfortable. This line should appear right near the top of the file.
It looks like lower values result in a faster mouse movement, but I'm not sure on the exact scale. I'm currently running with -60.0 and it seems pretty good to me. The setting also seems to only apply to the game itself and doesn't affect the main menu.