Unlocked dialogues and how it works in normal game

[Morgoth]

Was checking the following mod: https://forums.beamdog.com/discussion/81464/mod-heroes-thieves-and-moneylenders-banter-quest-romance-mod-for-bg2/p1

It provides the following component: 

Component 5. «Unlocked original NPC reactions» (by Tipun & Austin):
There were situations in the game when only one of all the NPCs spoke, although the developers provided replicas for each. After installing this component, all NPCs in the party will speak.

 

Question: I was pretty sure that one instance of this was if you turned into

the slayer and only one of your companions talked

. But I have just been in that scene, and everyone talked.
So, only one companion speaks there if you have simply a romance?

And by the way, does anyone know if that scene is the only instance where the component above is useful?