You are aware Kentico does have a Wiki module already right?
I haven't worked with the Kentico Wiki but I know in other solutions like Confluence you have the ability to create TOC pretty simply based on the content hierarchy. This should be no different with Kentico. Take the Tree navigation webpart and make a widget that users can place on their wiki page.
You might take a look through the http://ideas.kentico.com and submit your ideas/requests there.