I have two suggestions on how to improve the Suggestion Box.
1) An official "Sign" button.
I think a sign button would be great, you should have the ability to sign a post you like, see your signed posts and sort all posts by the most signed.
2) An Archive.
I believe there should be a separate Forum for posts that have either been deemed impossible or added to the game. This archive would be great for sorting suggestions, if someone suggest something that has already been deemed impossible, it can be moved to the archive, so it does not take up space on the front page, or the most signed page.
Do you have anything to add? Do you agree?