How do I redefine the keys? The feature seems to be present in to options, but there is no obvious way to change the keys.

Same for me.
Re-mapping doesn't work.

By the way, the game isn't playable in AZERTY.

So I played with gamepad :-/

use the --auto hot key-- program to remap keys. I had to do this for CoD Infinete warfare

It"s pretty easy. Create a small file, double click to run.

this is what I did to fix the arrow key issue with IW

up::w
down::s
left::a
right::d
NumpadEnter::
ExitApp
Return

www. autohotkey.com