Ultrawide (21/9) Screen compatibility ?

Hi fellows,

I have now an Ultrawide screen (3440×1440) and of course, you can imagine that there is no vanilla (or EB) option to make the game compatible with my ratio.

Is there a way to tweak that in the ini or config files so I can change the ratio ?

Just to be clear : the engine is able to show the game in full resolution (3440×1440) but the ratio is like 4/3 or 16/9 if I click on the "widescreen" option. Since my ratio is 21/9, of course, this is a problem : the image is flat.

Any help appreciated.