Here's an example of how you could create heirarchy and utilise different templates at the level of the individual page. First, imagine a templating interface that allowed you to create an outline heirarchy of the various sections of a site (just like you'd produce in the outline view of Word or using something like OmniOutliner). Now, each section of that site-map could have a distinct template attached to it, or inherit a template from the section above. Then all you'd need on the Wiki-page (as content-management interface) would be a drop-down box on the right that allowed you to choose which section the page you'd created would sit under.