Perhaps I can implement some sort of category pages, which would gather a list of all pages tagged with a particular category.
The administration section should be re-done to be a bit more "modern." It should include a dashboard, which will be extensible via plugins.
Certain types of wiki sites may have need to set up document "templates". That is to say, if there are a set of pages within the wiki which should have a similar outline and layout, it would be much easier to build and deploy that wiki if one were able to create a skeleton "template". Then, you could simply create a new page based on the template, fill out the relevant sections, and you're done!