The karma system would have no ship limitations. The server already has the information. It knows that one ship/player is constantly attacking and or interaction in combat with other players. If you have a person who trades almost exclusively, then the system has the numbers to make the decision. Its not as cut and dry as ship size and type.
The system would have the info, but it may not use it.
Repeated massively overpowered attacks on clean ships are the only 'normal combat' that Sandro mentions.
The definition of massively owerpowered is not clear, but it sounds quite a lot.