In the past I requested that all NPCs who have a comment on the way a particular situation was handled be allowed to comment in turn/and or interject. For example the way we handle the Nettie situation, etc... That is still my primary wish.
However, barring that, It would be nice to have control over which of my NPC companions comment. Basically I am suggesting that the chaining order dictate who gets the explanation point over their head or interjects, etc... I can simulate this today by effectively dismissing everyone but the person I want to comment, but that is a lot of work. I would prefer a simple checkbox/option somewhere that has the game always go with the first non-player controlled NPC in the lineup.