Suggestion for Suggestions ;)

How about two child boards/categories in the Suggestions board called "Denied" and "Accepted". This helps organize the suggestions so people can easily go through them and look to see if their suggestion was already posted or not.

That sounds like a good idea, but I think it's a bit unnecessary, because if they look after the title, he says if the idea was accepted or declined.

Good idea although it's unnecessary for now.