I had found this semi-old blog on Glee wiki: w:c:glee:User_blog:Svwiki99/New_Wiki_Features and wanted to know how to turn on these features. I can't find them in the admin dashboard (if that's where they are at all...)
For the auto-refresh, add the following code to your wiki's MediaWiki:Common.js:
ajaxPages = ["Special:RecentChanges", "Special:WikiActivity"];
To add the "Back to top" button and the hover feature for dropdowns, place this into MediaWiki:Wikia.js:
What do you think?