This feature got lost when lp:compiz-expo-plugin (without this feature) was merged to the compiz trunk.
The code to add this functionality back can be found from lp:ubuntu/compiz-plugins-main
This feature got lost when lp:compiz-expo-plugin (without this feature) was merged to the compiz trunk.
The code to add this functionality back can be found from lp:ubuntu/compiz-plugins-main