Hi, Feed Demon has this very useful feature to pre download articles offline so its very useful for people with slow internet.
Unfortunately, we do not plan to implement the function.
I'd second this suggestion for a different reason. Precaching the full html and embedded images etc would speed up the experience dramatically even on a fast connection. Some of my feeds articles are on various servers around the world that take 2-5s to load each page. It would be really fantastic if the page loads instantly from local cache the *first* time i click each article.
Thanks for the hard work, this is hands-down the best rss reader i've found on Ubuntu.