@ Kaluura :
I did try the french version, and it doesn't change a thing. You still move with WASD instead of ZQSD. and indeed, the position of the keys makes this option useless.
@ Cerise :
Heh indeed a complicated way. But thanks for taking the time to explain, I may give it a try, if I ever feel adventurous.
Still, I would like to emphasize that it's not an idea of mine that i'm trying to push because I think it'd be nice. It's actually WRITTEN in the preferences that you can choose to move with WASD or ZQSD. And apparently you can't. It's like LL wanted to give this option and forgot to code it. So well.. i'm just pointing it out.