What do you mean by "timeline mode"? I am guessing recent posts?
"Show unread posts since last visit" will give you the same as clicking "discussions" elsewhere
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I know that when any thread/post is clicked from the "show unread posts since last visit" it will disappear from that list, so I have just discovered a new option/timeline for you Chris.
Down in the "forum stats", above "users online" is the option to click "View the most recent posts on the forum."
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I believe this may be more of a timeline like you are looking for...
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