Nope it doesnt understand anything other than 4:3 resolutions - it was made in 1999 god damnit
i type"How do I set a non-standard resolution? Widescreen?
You’re in luck, not only do we have instructions for setting a non-standard resolution, but in Widescreen modes we’ll display Quake 3 more properly than id’s last version. So for my macbook, I’d set:
* r_mode -1
* r_customheight 800
* r_customwidth 1280
then if I’m in-game I would use vid_restart
Note that the in-game video preferences will not list your new resolution. This is normal."