They should have for Beta Testers the badge of Pioneer Of the Game, Near Betas Which is From September 2 to December 25th 2008 would get Frontier/Pre-Classman Everyone else would be Alric Member= December 26th 2008- Sept. 2nd 2009 Azure Member= September. 3rd 2009- Feburary 21st 2010 Iron Member= Anyone else
I'm not really sure about the badges. Why do people need a badge to show when they joined? It isn't an accomplisment. It would only make a divide between old and new players.
You could always ride your pioneer dragon to show you joined way back when though, or frontier dragon in my case.