If you want to use Monologuing on your own instances, I've split it out of my own branch and made a fork of 1.1.2 with the feature added. You can find it here: https://github.com/STJrInuyasha/mastodon/tree/monologuing
View the full post: https://is.a.qute.dog/@KS/2272/
Updated the Monologuing branch to be even with tag 1.2.2
If people care about it I can submit a PR for it...