When in WOW camera, pressing the key for 'Backward' and the key for 'Attack' simultaneously triggers the 'Special Attack'.
That is, in addition to being triggered when you press whatever key you have set for 'Special Attack', it will also trigger when S and LeftMouseButton are pressed simultaneously for instance.
This happens ONLY for the WOW camera, not the Original or the TPS.
This is not some intentional feature specific to WoW; it has no useful purpose and simply gets in the way time and time and time again.
It makes using any character that actually has an active special attack extremely difficult to use because you keep triggering the special attack while in midair (especially if you use instant gas launches often).
Has been ongoing issue for months. I've heard of mods that have got rid of it, so I don't believe it would be terribly difficult at all to fix.