Looked like a great plugin, and I could say it's a good start.
The fact that is missing the possibility to set the timing when posts from a feed are published and the number of news to take over at one time makes the whole think unfortunatelly useless.
Could be fine to aggregate news from little blogs or so, but imagine you want a feed from a big news outlet.
Well, I definitely do NOT want to annoy my users with 100 posts a day anytime during the day or night, and unfortunately there is no way to limit that with your plugin. :-(