Re-Mapping keys ?

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Hi i am having problems with remapping the keys. As i am disabled using default movement keys (W,A,S etc) is not an option for me so i have to use other keys. The game will allow me to remap exactly how i need it but then will not retain settings !!

Can anyone help please as i'd like to play this game it looks fun from what i've seen when i joined a server (running about in a straight line lololol)

Thanks .... BobBones