Filtering by Post Category

Hi there.

We've been using Recent Custom Post Types as a way for users to display their sites' posts in a widget on their homepage. The sites don't actual have any custom post types, so they're always displaying "Posts".

We'd love to be able to display posts from a specific post category. Is there any way to do this? Is there a way for our developers to extend the functionality of this plugin? Is there a better tool that we should be using to display posts in a widget?