I’m also looking for this feature. I had to manually fix hundreds of posts after import (cosmetic edits due to formatting) but didn’t realize it was sending notifications to the users. It was terribly embarrassing, because it sends weird signals when it looks like someone else has edited your content, even if it was actually just formatting. (Revisions are not publicly visible for other reasons.)
The only way I’ve found to get around it at the moment is to SSH into the server and do it through the Rails console.I’ve also had to disable users’ ability to add tags, because it creates more work to have to SSH into the server to change/remove them. Adding new tags to posts is also awkward due to the notifications, so I’m switching to SSH for that too.