The problem is, that is exactly what Suggested Topics at the bottom does… I’m confused because you seem to think it doesn’t do this.
Suggested Topics ALWAYS puts your unread and new items first, clicking on any of those will take you to where you last read, thus you start at the first unread post.
Then when you finish those sequentially, the suggested topics at the bottom will have the next set of unread/new topics for you to view, again taking you to the next unread post in that topic you’ve previously read.
In reality, you are simply looking for a shortcut key that opens that first suggested link while reading a topic. Or you can simply click that first link in the suggested topics, as its indicative to what you haven’t read yet (at least until there are no more blue dots or blue circles with numbers in them next to the item).
Case in point. I started about 4 posts up on this topic, because that is where I had left off from yesterday. Today, I finished reading to the end, and look at my Suggested Topics
Notice how it prioritized unread posts/topics in the Feature category! It did exactly as you outlined, all I have to do is click the first one, which takes me to
Where I just read that unread post, and again, look at Suggested Topics, it now shows the next unread post/topic in the Feature category for me to read next!
So in all reality, what you are describing exists. And eventually, if I do enough of these, I’ll start to see New topics, which have a slightly lower prioritization than unread (as unread is indicative that you showed interest in the past in that topic, new, there is no such indication, it may be of interest, it might not be).
Granted, after reading your prior post again, you seem to want to take the unread posts of each topic and place them all on a page together. Which seems crazy, as you lose a lot of context that may be required. What if the new post in topic A is in reference to post 2? How do you figure that out (especially if they simply used the reply button on post 2 of Topic A instead of quoting post 2?
I’m not sure such a feature would be that helpful, it could be done in a plugin though.