Comment 11 for bug 1283849

Thank you very much Lem, it works with Unity Tweak Tool.

In the meantime I discovered that it works also running the following command:

$ dconf write /org/gnome/desktop/wm/preferences/action-middle-click-titlebar "'lower'"

It might sound crazy, but this is one of the most important feature to me!
Anyway, it would be nice to have the mid-click on the title bar working again by default :)