Well there's a separate plan being discussed right now to upgrade the API to ServerResponse anyway. writeHead is going to be deprecated, so that's not the best place to put it. But I do agree we should minimize unnecessary properties on res. It would be nice to have a pseudo standard way of specifying options across node. I haven't put any thought into it yet. But one thing I like is just using an options hash. It's not just for functions you know :)
res.options.shouldSendDate = true. This way we can add whatever we want and the chance of collision is minimized. Of course options is a fairly common name. That's why it might be a good idea to come up with some kind of convention. People know enough not to name a function "on" or close" these days. :Marco
