ARR, like version 1, will support multi screens. Are you talking about a 4th screen just to show map and other stuff? And three screens with zero GUI/HUD interface? They already said it was going to be customizable (GUI layout). Not sure what you are asking for. If its for a 3 screens + 4th for menus I think you are not only in the minority for a wish list- but you'll be out of luck, too

If the GUI is customizable and the FoV isn't messed up with a 5760x1080 resolution just move the GUI off the main display.