That's what i meant with there needs to be an option to dont say anything. In SWTOR was a timer and if you dont answer in time the others roll for it and if you want a specific person to talk then just dont select any answer.
"When 4 people are in party, and every single one of them pick differen choice, the result then dont feel like roleplay, but random number generator output." I would disagree here because in a conversation with a group there is usually not one talking and a group which consists out of strangers ingame everyone has its own agenda. But i can see your point.
