This plugin adds some nice features to your standard widgets.
Standard Widget Extensions is extension for WordPress standard themes, Twenty Thirteen/Twenty Twelve/Twenty Eleven/Twenty Ten. It's also effective for themes which use widgets in a standard manner.
Current version of the plugin offers following two features. You can individually turn on and off these features.
Twenty Twelve/Twenty Eleven users can use this plugin out of the box. Twenty Thirteen users have to need some work to use it. Other theme users can adjust class names and/or IDs to suit the theme. You can find options for the plugin by selecting a menu 'Settings' - 'Standard WE'. Detailed description for parameters are in the plugin homepage.
I would appreciate your feedbacks of settings for your favorite themes. Or if you don't know how to set IDs/classes for your theme, don't hesitate to ask it in the support forum.