So, when/where can we see it in action? On the testwiki?
If you just want to play with it, you can see it doing something simple at: http://theplaypit.nickj.org/wiki/index.php?title=Page , and you're more than welcome to create any test pages you like on that wiki if you want to play with it. The documentation at http://www.mediawiki.org/wiki/Labeled_Section_Transclusion covers the syntax and how to use it.
If you want to play with it on the cluster though, that's not something I can answer.
All the best, Nick.