Meta: More often than I should have, I have emailed HN and asked "Why can you not extend/build/etc" this? And, as expected, we'd get into a great email discussion about why that would provide a meaningful improvement over the existing experience. This is a forum of builders, makers, and hackers, to their unspoken point. The primitives provided are "good enough," Hacker News is feature complete. To build this on top of HN in a browser extension or mobile app is trivial, and so, I'd say "If you want this, build it and share with us."

Ask HN: Any good replacements for "Refined Hacker News?" - https://news.ycombinator.com/item?id=48845676 is an opportunity, for example. Show HN awaits for whatever you build.