Horizontal+ field of view scaling
Field of view should be scaled depending on the display's aspect ratio. For example, a FOV of 90 degrees on a 4:3 display should be automatically changed to ~106.26 degrees on a 16:9 display. This way, users get a sensible FOV out of the box, even if using a widescreen display.
This should be disableable with a cvar (for supporting legacy configuration files, and those who feel old-school).