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/
The monologuing branch is up to date now with 1.4.1. Since I needed to redo a lot of stuff due to the switch to webpack, the old branch for 1.3.3 is still available too.