I guess it‘s too late in development to get a system like that in place. For people unfamiliar: SWTOR has a party dialogue system where you get throw a dice and the highest number gets his dialogue option. That would make playing in a group more fun. If you wanna have a specific person talking there should be an stay absent answer. I would really love a system like that implemented so everyone can participate during conversation and there will be funny outcomes for sure.
In Swtor the different classes has different dialogue choices depending on class, rank and race and they are unique for every person. Basically every character has unique choices. You choose your answer and the the dice roll decides who is allowed to answer and answer with his own character and his choice.
Everyone gets included in the conversation and can participate instead of being a bystander which makes the group dynamic way more interesting and the unique aligments more shining out.