Changing workspaces with a scroll wheel

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Using compiz in Ubuntu 10.10 in Compiz Settings, you could set the Desktop-based viewport switched to use scroll wheel up and down to flip through the workspaces. In Fedora 16, I have found in keyboard shortcuts that there is a place to set the hotkey for switching workspaces, but I can't set mouse buttons. I understand that it's "keyboard" shortcuts and what I'm trying to do may not work. Is there any other way to do scroll wheel workspace changing?