I feel that we are lacking the ability to display those submissions that their languages had already been disallowed. For example, when I tried to solve this problem, I wanted to compare my solution's performance with others, and found out that I am the only one who has solved it in Java 8. But there are also plenty of others' solution in Java 6, 7 etc..., however, to find them is not a trivial task. So I think this kind of feature can come in handy.
What are your opinions, guys?