You can type /report <name> <scam, phisher>

Though yes, it does seem a bit limited. Plus I always think that at the same time you did your 1 report, there are 9999 reports that someone said "I hate you" in the game or "They tried to sell me egg for 1000 when I KNOW that egg is only worth 990!"

I am sure everyone does what they can.

Do the best you can, report in game and report here.