Mouse buttons

Hello, I have bought a new mouse. With only a few additional buttons. The game recognizes them as ctrl+a; ctrl+x; cltr+n; ctrl+c. Is there a way to change this? I use the ctrl+a combination to level up my 1st spell. And that is needless to be used on my mouse. If it could be decoded as (for example) ctrl+k it would have been awesome ^^
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