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/
Branch 'monologuing' is now up to date with 1.4.3, as well.
Backup versions also exist for 1.4.1 (backup-monologuing-1.4.1) and 1.3.3 (backup-monologuing-1.3.3).