Hi! First of all let me tell you that your plugin is great I just voted it so! ;)
However I would like to suggest a tiny change which can improve its usability a lot. Currently, shortcodes can't be used inside the widget textarea, title, etc. For a project I'm working on at the moment I needed to enable them in main textarea so finaly hacked the plugin to change line 35 in file page-teaser-widget.php from:
echo '<p>'.$instance['text'];
to:
echo do_shortcode('<p>'.$instance['text']);
And now I'm able to use shortcodes (comprehensive google maps SC in my case).
It would be great if you include this improvement in future releases.
A million thanks again for your plugin!