Absolutely no. It must be the other way around. The radii for the dialogue triggers should be removed completely, so that you have to address the NPCs for the dialogues and there are no automatic dialogue "accidents". In many places exactly this was criticized in the whole EA, that for example after a long fight you suddenly trigger a dialogue at a party member, which you didn't want to have in the dialogue, but that particular party member was closest to the NPC... (And yes I understand the game design behind it to create more rl authenticity, but am still against it).