I also have track IR 5 and use the FOV change on joystick, I find it more helpful the way it is, sorry. Also if you zoom in with the FOV do you notice that dots at exteam distance disapear or become to small to see so the wide setting is best for looking for others while the close good for targeting work.
.
I am not saying that your option does not mater mate but am adding my 2c to the debate. Maybe if there is an option box to have it one way or the other, that is when the development team has fixed the major bugs.