I had the same issue with cod:waw, I couldnt get the thing to stop recognizing the shift button as a melee attack. My solution: map the 'problem key' (in your case home button) to another mouse button, and it should clear it from the mouse button that you dont want it to be on. You may, however, have to pick another mouse button for it (middle mouse, mouse3 or mouse4) to clear it from mouse1.
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