If it were a true SP rpg then the dialogue system would have had companions interjections and only the protagonist as the conversation initiator, but since it isn't I too doubt that anything will be changed just for SP.
Basic interjections are easy-peasy, and I would
hope their dialogue editor has some way of knowing whether or not a character was player-
created.
If they don't add in that style of party dialogue, it would be a fun mod to make, like the old banter packs for Baldur's Gate.
