Suggestion: Don't drop threads off the face of the Earth when using timed activity sort

I'm currently using 24 hour sort, and it's great, minus one thing - threads older than 24 hours just disappear. Perhaps a better implementation would be to keep the threads showing up underneath the <24 hour ones, but prevent them from being bumped up by new posts.

Example - if I go to ~comp right now, there are only 5 posts. Older ones, imo, should still be visible, just no longer bumping.