How do I disable the alt-right click keyboard binding?

Using Oneiric 11.10 and Unity. I want to disable the context menu that appears with Alt+RightClick. Alt+RightClick is a much used shortcut in Blender. It's possible to remap keys in Blender, but I was hoping to be able to turn it off in Ubuntu so that Blender get scontrol. I update my Blender installation often, so it's more convenient not to have to change settings every time.

It's in CCSM ▸ General ▸ General options ▸ Key bindings ▸ "Window Menu" ( Alt + Button3)

Because disabling it does not work (at least in 12.04 and 12.10, probably earlier versions too), you will need to change the shortcut to something else, like Super + Button3.

Warning - You should be very careful when using ccsm; see this question for details.

I have had the same problem and it's happened to me twice now. Both times I found this post and tried the suggestion of disabling the key binding and it does not work. However changing does work. I changed mine to shift-alt-rmb and it works fine.