[Admins]

Yes Tyhm had the idea of making a ranking sytem. It could be similar to the forums thing, where you say if someone is good (1) or bad (5) or so. It needs some protection against gangs making someone down, and comments would be nice.
I don't know if its needs something technically, normally the kingdoms should handle that, giving scammers bad reputition, while other kingdoms might support scamming rich people etc.
I am not sure if its really needed for 'scamming' though, more for general game play (someone 'steals' monsters etc.). For preventing scamming the players should use the secure trading methods, and report if something is not working probably.