I want to be able to use my special mouse buttons to move windows between workspaces:
Ctrl + Shift + Alt + Button 7 should move the active window one workspace to the right.
Ctrl + Shift + Alt + Button 6 should move the active window one workspace to the left.
This worked fine in Ubuntu 14.04 and earlier versions: CCSM > Desktop Wall > Bindings > Move with window within wall > [Set appropriate combination]
In 14.10, I can only set keyboard shortcuts! How can I set up my desired combination next to the default keyboard shortcuts? Is there a compiz config file that I could manually edit?