Preload Feed Content (Wifi and/or cellular)

I didn't find a way to fully preload the content a certain rss feed points to.

My idea is to have all the feeds ready to read when I enter a train with poor network connection because the app has already downloaded them when being connected to a better network (home wifi or better cellular connection).
Ideally it would be configurable as much as possible (which network types, update interval and such).

Great app, already using it every day, even without that one awesome feature ;-)