I've also updated the "streaming" page to indicate which of the threads/post are unread. It's... actually pretty cool, being able to scroll through a bunch of posts and see which are new among the ones you've already seen. I recommend checking it out.

However, because the streaming page has the potential to display many, many posts, and unintentionally mark as read more posts than you're wanting, I'm keeping it from updating your history unless you click on a thread explicitly. Maybe I can make this a user selectable option in the future, but for now erring on the side of caution.

Remember also that there is a "speedread" function under Shortcuts > More, or through the Search feature by clicking on "Mark these posts as read" for a given search result. Seriously, it's useful.