There are some bugs filed to fix the way feeds work, one specifically would pretty much remove the comments on this site aspect based on a setting within the feed. But coding it is completely beyond me, and I don't think it's claimed, it'd be a low priority for most devs currently as there's so much user facing stuff to fix.

It is something many would like to see done though. But it's nowhere near the top of even my wishlist, and I'm more keen on it than many (plus, you know, not a coder).