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I did a patch to introduce this but it hasn't been integrated. I have no idea of the status of it. You can have a look at jira, there's the patch there.
I saw your patch some time back, and have actually been using that myself, with a few extensions, in an application I've been working on. I'm hoping that it does make its way into the main cvs codebase soon, as it has proved quite useful to us.