add the same time stamp we've seen on posts but to the opening post. Right under the author username. This will not hurt the page numbers or make anything wider. It will just be like the one on the right, the last reply time stamp.
I'm a bit paranoid it won't be possible with phpbb
If the topic has 0 replies, you will see both last posts. Or maybe remove the right one for these types of topics, since they are not counted as a reply on the reply counter.
Great for forums where you want to know the age of a topic without having to go inside of every single one of them. Feature requests, Technical support, Introductions, Announcements and all Beatmap forums.
It will also make it easier to see duplicates, which one of these are older/newer? All we know now is the last reply date.