I vote for banning signature and one question. What is the difference of a temporary signature ban to an amount of merit they should earn?
Required merits to back to normal status will lead to massively merit abusements.
Of course, abusers will be found, get punished later, but I don't like the idea.
It is so ridiculous if a old accounts (Hero or Ledgendary) does not know about forum rules on plagiarism. Therefore, they deserves perma bans if they intentionally and lazily violate forum rules, especially on plagiarism.
For Newbies, it does not matter with them if they got permanent bans, I believe.