I set it that way on purpose. On the old platform, once you'd posted you couldn't go back an edit.
Why? It's a pet peeve. I've seen people post opinions that were just downright stupid. Then, when called out, they went back and either deleted their post or changed it. (You've seen the drive-by drunk posts on various forums, I'm sure.)
Now, this is up for discussion if it should be changed. But, my thinking is if someone one is going to voice their opinion let it stand/remain for all to see. IF they find out they're wrong, let them say, "oops, I was wrong." I don't like the ol' "I never said that" when it's known they did, but deleted it so there's no reference...
Members? What are your thoughts on that setting? Five minutes, IMO, should give plenty of time to correct any typo's, etc.
Guests are those not logged in or those who haven't registered. Bots, like Google's, are noted as well. I've not looked at it closely but I'm assuming "notable" has to do with the number of posts a member has...
In the future we're going to refine the navigation tabs: it's on the list, just not next on the list.