Reference Classes: Generalizing Reference Class Generator objects?

x <- TestClass$new("test")
x$print()

Is it possible to override the $new(...) in the reference class generator? I
have tried adding a "new" method to the methods of the class, but that is
obviously not correct. I have also tried adding it to the class generator,
but the class generator still uses the default constructor.

As a simple example, this is the current interface:
TestClass <- setRefClass ("TestClass",
? ? ? ?fields = list (text = "character"),
? ? ? ?methods = list (
? ? ? ? ? ? ? ?print = function () ?{cat(text)})
)
test <- TestClass$new (text="Hello World")
test$print()

I would like to override $new(...) to be something like (add a "\n" to the
end of the input, no need to specify input fields):
TestClass$methods (new = function (text) {
? ? ? ? ? ?text <- paste (text, "\n")
? ? ? ? ? ?methods:::new (def, text=text)
? ? ? ?})

The constructor would then be:
test <- TestClass$new ("Hello World")

This is a subtle, but useful change. I have also tried adding to TestClass a
method $newInstance(text), but that was not successful. If this is not
possible, could we consider augmenting the Reference Class interface to
include constructors?