Disable mouse in settings then run this. Source for hack available here.
Since the release of the engine's source code, various source ports have been released. See the link above for details and recommendations.
The following wads are designed to fix some sort of game data bug or a feature short coming of the game. They do not add any levels/change play style and thus are generally compatible with most user addons.
Depending on your choice of source port, you can usually change the field of view with a console command, or even in the options. Try fov <1-179> or gr_fov <1-179>.