vBulletin 4 might not have had so many useful features, but we found that Double Clicking the Forum Node Icons to Mark a Thread as Read was a really cool feature.
This is why we've took Vincent's old Template Edit and created it in an addon for everyone to enjoy.
So what does it do?
To say it simple, if you see this.
You double click it and that forum is marked as read
(It doesn't trigger an overlay and doesn't redirect you to the forum after doubleclicking)