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I also agree that posts should be locked after a while to prevent editing. I hate rereading a post I thought I already read, and finding new information there because they edited it after I read it the first time. Maybe the post_time could be updated when it’s edited? Then it would keep bumping to the top?

I don’t know how to make a plugin yet, but here is what you would change in the core bb-includes/capabilities.php, comment out lines 348 and 349. That seems to do it for me.

if ( $curr_time - $post_time > bb_get_option( 'edit_lock' ) * 60 )

$caps[] = 'ignore_edit_lock';