Managing news in our case involves not only filtering news but also editing items that are of bad quality of have information missing. We're trying to syndicate data from low-reliability and quality pages to need-for-high-quality information outlets, that's why we'd love to see the feature to edit single feed entries.
As all items are stored locally, this shouldn't be too much of a problem technology-wise.

One might think about keeping the original item and saving the edited one as a copy and also about clearly indicating that a feed has been changed from its original.