@Robby don't forget that the expired badge is only seen by moderators, it's not seen by regular users. I have it enabled as it allows me to see which threads have previously been featured so I can avoid re-featuring them unless I really want to.
The slider can be displayed on the page, forum list and possibly forum view - I haven't decided on the last one yet as I doubt it will be used there.
Likewise for the new posts page.