Delete all Wall Posts

We are currently able to delete all of the wall posts we written ourselves and the ones that are on our wall. But I would love for a function to either hide or delete the other posts on my wall as well. Like the achievement ones or the ones about the Chocolate Frog Cards as I don't want them all to be displayed.

Addition: For Prefects/Staff it's possible to see all the wallposts but with a small notification saying which posts is hidden and which one isn't. In that way they can always check up on posts that are innapropriate or what ever.