The method of struggle / filtering flood in the comments to the topics

It has long been no secret that in the comments often has a phenomenon called flood. In the comments flood Trolls and fanatical opponents (including virtuals) of the ideas presented in the article. And the system of accrual of karma is precisely aimed at informing Habrazhiteli about who is the commentator. But not every person will climb into the profile of the interlocutor / opponent to watch with whom he leads the discussion. Actually the proposal is to visually visualize the icon of the habrazhitel based on his karma / rating / badge. For example, a person with a troll icon, next to his nickname and avatar, depicts a pictogram of a green dirty sign, or Trolls should be deprived of the right to have an individual avatar and instead of it should be a Troll icon. And for normal users, they can change the size of the icon depending on its karma / rating. Why comment, for example, Bumburum looks the same as the comment of some trol. But the concrete implementation of the plan is better for designers.
And one more small idea of ​​the topics that have come to the main page and after some time have passed the rating (topic) below the checkpoint should be removed from the main one.