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.

I've found that it's difficult to keep track of threads I found interesting but are no longer highly active, especially without a search function. My suggested solution is the ability to subscribe to updates on a topic/thread (whatever you want to call it) and enable easy access to checking up on the thread for updates without having to receive a direct reply to my comment on the topic. If this already exists and I'm just blind, let me know!