Right now when we are in conversation, only one who started is able to paticipate and take decisions on behalf of all party members. But this is party based game and every member opinion should be visible, so we can see what they all have to say and perks we can use, roleplaying will be enhanced by including this feature. I have seen "Solasta: Crown of the Magister" do this but in limited way as shown in screenshot here : [Linked Image from i.imgur.com]
I don't know if this is possible but there is no harm in wishing. I'm enjoying game very much and very excited for the future update