Hi AmeerNuub,
I too looked at BL1 recently. I can say I had a whole heap of fun with it in 5760x1200, Steam version.
The info at the link below has notes on additions to startup config files. Look for the FOV/camera tweaks. I was happy with a single keypress at the start of the game to set the desired FOV. I just dealt with the fact that while sprinting, we have a 'moment' and an extra keypress to reset the FOV when exiting from a vehicle. You could probably do more but it certainly gets you going.
http://borderlands.wikia.com/wiki/Borderlands_PC_TweaksWhat I couldn't find anything to fix was the intro and configuration screens. Best to maybe do all your settings in single screen and remember the flow of clicks entering and exiting from a game.
Good Luck