Thread:Sannse/@comment-1321260-20131103191532/@comment-8-20131105015522

I'm afraid it's going to be "no" to all of those. You can add CSS and JS to the site, as you probably know... but you can't change the underlying code (or even the underlying CSS/JS, yours just goes on top). So that takes out the badge changes and (I would expect) the category feature

There are also some restictions in what you can do with that CSS and JS, which would include hiding pages. The details are here

By the way, with these questions, it sounds as though you might be interested in the Volunteer Developer Program. I don't think they are adding to the group at the moment, but it might be something for the future :)