The Problem is a bit more complex... If you have a widescreen and don't use FOV 90 you have a disadvantage ( everything moves faster ). If you use FOV 90 you have an advantage ( you see more due to broader monitor ). So both ways someone loses.
There is no easy solution to this, since no wide screen user wants to play with a crappy image. And no 4:3 User wants to have a disadvantage either...
Like Verbose said, in many PvP based FPS games, this was an option made by every user as they pleased.
And making this able for all players, would at least be a way where noone could critisize another person. Since everyone has the same possibilities...
BTW you can't turn faster... the ship has the maximum angular velocity when the cursor is on the edge of the screen. And this velocity is determined in another ini file!