But people are still capable of being biased against community team members and members of the dev team, either individually or as a whole. If Tanaka posted here under the system you propose, do you really think the dislikes for his post would be purely a product of his post and not dislike for him personally? When people are unhappy about the direction of the game as a whole--like they are right now--don't you think that any official post is going to get more than its "fair share" of dislikes? Biased responses apply to both player and official posts, so there is no reason to treat the two differently.
As for showing that we are against a change or update, that isn't the problem we have. Unpopular changes can be easily discerned by the tidal wave of negative responses and the high number of likes for those responses. The problem isn't that the community reps can't tell that we are unhappy; the problem is that the dev team doesn't care. There isn't any change that we can make to the forums that will change that.
Finally, we keep seeing posts from the dev team asking not to just say that we don't like something, but to offer suggestions instead. So why do you think they would have any interest in a feature that has no purpose except to give them something they specifically said that they don't want?