There are options.
1. If you want full topics (whole mega-thread) to leech. Use "Topics" leeching. You will need enter topic ID and whole topic will be leech.
There are topics with 250 pages so I think this might be what you want. It would leech all pages from topic.
2. You can add that URL (user page) to "Pages", but this would leech first message from each topic.
You will also need a custom selector for this to work. Go to "WEBSITES" -> select that website -> "Selectors" tab -> add these selectors for pages leeching to work:
Subject with url:
Code:
div.title a:eq(1)