Is there a way I can add workspace indicator in Unity/Metacity? I'm trying to find how to enable it using gconf-editor or gconftool-2 in a way similar to what's shown here
I know exactly what you are going for. I saw this in an article some time ago the link to which can be found at the bottom.
In 12.04, you can install that by running these codes in terminal:
Once installed search for it in the Unity dash and done. You may also need to add it to the list of start-up applications.
In 12.10 Quantal, you have to install the .deb file built for 12.04 Oneiric manually (as of January 2013, the PPA doesn't have a package for 12.10). The .deb file you can obtain from the aforementioned Launchpad PPA page. Run these in terminal: