Allow construction of stream classes?

While we're talking streams, I've noticed that all classes in the `js.node.stream` package have private constructors. I've found it useful to construct streams, for example in string-to-stream conversions:

``` js
var s = new stream.Readable();
s.push('your text here');
s.push(null);
```

(Example from [here](https://stackoverflow.com/questions/12755997/how-to-create-streams-from-string-in-node-js))

So would it be possible to make one or more of those constructors public?