The game does not support more than 1st monitor simultaneously. Yes, now there is option for Ultrawide screens (21:9), and the game normally support scroll for the map and in 3D view (on border) if you have more than the 1st monitor. Not more.
To support 3 monitors it need to be rendered a completely different way, not stretch the image.
Last edited by andrey12345; 03/15/15 07:26 PM.