I just found a small bug you can maybe consider to add as another to-do to your future tweaks list.
When you enter RSS link to your widget settings in the Back-End it appears with 'target="_blank"' attribute which (as you know) opens link in the new tab. There it triggers downloading and it is not helpful at all :) It happens just in Chrome (tested on Windows and Mac). I fixed it manually - removed
<?php $new_tab; ?> variable from the plugin code, but it would be good to implement it in the future releases so I don't have to do this every time I upgrade the plugin!
Cheers mate, the plugin anyway is great! Keep up! :)