Is there a nice syntax to achieve optional named parameters?

[rikki cattermole]

Longer term, you're better off with the builder. Even with named 
parameters (2 DIP's are in the queue for adding it).

Creating windows is a very complex task that can balloon in scope.
Being able to hide it away in a separate type can be quite desirable if 
you want your windowing library to be actually useful in not just one 
simple case.

Of course that doesn't mean you couldn't hide that its there ;)