You just edit the name that the applet sends to the server. It's a simple editing of a variable and all the server does is check that a username is in admins/ban list and gives permissions based on that.
I'm not going to explicitly announce how to do it, nor will I disclose such information privately. I'll just say, it's incredibly easy to do. And a lot of people do, do it. Either way, it should cause you no harm to follow my instructions and enable verify-names. If there wasn't a vulnerability, this option wouldn't be there at all. Right?
They say knowledge is power. Giving this information away to everyone would improve the mass intellect of those that use the game since they would have prior knowledge to such "hacks" and how to better avoid becoming a victim of them.
I can dare say the pleasure has been all yours. You have poor credibility in my books now and I'll take everything you say with a pinch of salt. You basically also advertised yourself a griefer by requesting information that's classified as "hacks". And since the only useful value of knowing it is to cause mischief... well, you get the idea.