The new sort factor is bump. All the way down and age and score all the way up turns the site into reddit. And all the way up and everything else down turns the site into 4chan.
Personally I'm going to be using something in between.
For the new users who were probably confused by the post orders I got this feature in yesterday but didn't get the UI for it in, so it spent a day pegged to 1 as a placeholder. I should have set it to zero as a placeholder. But thankfully it only had the wrong placeholder for a day, and now you have full control over it.