Request: option to show widget on certain pages only (via shortcode)

Hi!

This plugin works very easy to implement the widget. But it’s an all or nothing solution right now. Our client wanted to have the widget only on certain pages only.

What I now did is deactivating the option Active in the plugin settings so it did not show the widget.
I added a shortcode in my theme where I placed the widget code. And then added the shortcode to the contents of the specific pages.

Perhaps this would be a nice option to build into the plugin itself.