Wow are they a bunch of wet blankets. There is no more risk of EE having security issues than any other code. EE code is generally small (miniscule). Lots of rhetoric in that link, but almost nothing meaningful but 'we want to be taken seriously'.
Maybe I'm a wet blanket as well, but I'd rather not have undocumented features if there's even the slightest risk of it introducing bugs or vulnerabilities.
Sadly there isn't much room for Easter Eggs in the modern professional IT industry since software is constantly being attacked (it's hard enough keeping documented features secure!). Which is why these days most Easter Eggs tend to be hidden away online[1][2]
http://msdn.microsoft.com/en-us/library/windows/hardware/ff5... mentions a toaster made by "Fabrikam, Inc.", a fictional Microsoft company. Could it also be a Microsoft easter egg?