Sorry, I can't find a way to change the current setup. As others have mentioned, if you want to see a chronological listing of all posts just click on the 'What's New' or 'Activity Stream' links on the upper left of the page.

If you want to see a chronological listing of your posts, click on your username at the top right of the page.

If you would like the threads which don't interest you but show up under the 'The threads below have not been updated since your last visit but still contain unread posts' section to disappear, just click on the 'Mark Forums Read' link.