I mean, you don't have access to pg's version control, but he released the News.YC source as a part of Arc (http://arclanguage.org/install) with the directive "go now, and bring forth clones."
It'd be pretty trivial to add once the RSS feed in general is fixed (as in, maybe 5 lines of code). In some ways this patch is an experiment: if it looks like in general Paul is interested in patches I'll probably implement a few things on my wishlist. If this patch in some form doesn't go in, it's honestly not worth my effort to implement / fix things since I don't have any intention of running an arc news site myself.
Well, the current feed is basically invalid. It's not structured the way RSS feeds are supposed to be, and I'd consider breaking the Twitter bot better than breaking all newsreaders. I've at least tested in Mail.app and Thunderbird and I've heard the same for Google's reader. I'm a really heavy RSS user and news.yc is basically the only news site I frequent where the feed is not usable.
If I were reading via RSS that'd also open up some options for filtering with Yahoo Pipes, which I do with a lot of my RSS feeds, since I'm not particularly interested in the mainstream stories that hit news.yc (NYT, BBC, Slate, Salon, et al)
It'd be really nice if the RSS feed went to HN and not directly to the article. The RSS feed is useless to me as I have to have the HN page open anyway to get to people's comments.
Tried it once with a Yahoo Pipes mashup. The problem is that it gets an "updated" status every time somebody writes a comment which is annoying for the way I read RSS.