Focus follows mouse for Unity

Something that I love from X window systems is the possibility to activate a window with no click on it. However, Unity and Gnome 3 by default do not make accessible this feature. I googled how to activate the "focus follows mouse" feature and I found this link. I typed these commands and now the feature is back ;-)

gconftool-2 --type string --set /apps/metacity/general/focus_mode mouse
gconftool-2 --type boolean --set /apps/metacity/general/auto_raise false