User blog comment:TheFallenOneGOTH/Project Darwin Suggestions - Helixsoft/@comment-4519283-20140114223126

I'm going to go over some of your points, not all though (I don't have all of the time in the world)
 * Add Vector and Modern skins from Wikimedia projects - I was actually commenting on this from another wiki. Highly unlikely that Staff will put it in because Wikia is so heavily modified from MediaWiki, but it would be a fun project to try to make it in JS... even then it would be just for personal use
 * Customize the search box to include other wikis - This works on Community Central, but you can only search for wikis, not individual pages.
 * Add a sandbox page to all userspaces - This can be done manually be making a /sandbox page.
 * Edit the HTML of your wiki - Like Thisismyrofl said below, it isn't recommended but you can do anything you want in JS. If you can't apply a CSS rule to something (i.e. no #id), you just need to use a selector to access it.
 * Cloud uploads - Now that would be interesting... like select "Upload From Dropbox"
 * Default edit summaries - I know I just did this, just have to dig out the code.
 * 404 errors can be customized in JS, it's not terribly hard and Staff is fine with it as long as it's non-intrusive!