Content outline filtering for the users, now the content outline show every thing in the tree, and their is a simple filter associated with the content outline that will show/hide potential objects in the tree.
It will be nice to see this article about creating working sets in the paltforme.
http://www.eclipsezone.com/articles/filters-workingsets/
Users might want to hide nodes, spatials, geometry batchs, controlls ... .
Also it might be a great idea to cull the unneeded working set from the 3D scene as well.
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Maybe you should take a look at the Mylin project as well. Its about task focus.
More information can be found here: http://www.eclipse.org/mylyn/