Clutch

.ini
Support is native for most 16:10 and 16:9 resolutions, both grouped under the "wide" list of in-game resolutions.
For other aspect ratios, you need to manually input your resolution in My Documents\My Games\Clutch\user_config.cfg:
seta r_height
seta r_width

Other info:
In full-screen mode the FOV is based on your desktop's aspect ratio. You can force windowed mode with the following value:
seta r_fullscreen "0"

In this case the FOV will be calculated from the game's display resolution. So everyone can get a little taste of Surround gaming. Lastly, you can even adjust the base FOV to your liking by editing this value (at your own risk):
seta cam_fovInit "100.000000"

Something in the camera pitch & distance changes very slightly with the aspect ratio: the wider the screen, the further your point of view. This may be fixable thanks to a combination of cvars and game scripts, but it's too benign for me to even try.