But there have been good ideas in the replies too that I'd like and also good!... Such as the option to temporally block chat to someone if that person receives too many advises by RMT (Right clicking them and reporting).
This can easily be abused.

As for the suggestion of OP. Do you really think RMT will vanish? People will still know about it. Just a search on google for the game will give you ads for Gil sellers.