Steelseries and WASD differently bound

[steelsage]

I have this Steelseries WoW mouse and I have a problem.

My main actionbar is comfortably bound to

R Y T W
C S A G
V P B F

So today, I got this mouse and was trying to bind the pad on the side of the mouse to handle strafing and movement and found out that any button that I bind to moving backwards just binds S, which I have bound to a macro. Macros bound to moving forward pop my W Binding.

Is there a fix for this? Another software? Registry edits that I can make? It seems pretty lazy on steelseries' part to just assume you're still binding move-backwards to S.

Thanks.