Examples of the fpw_post_types filter in Feature a Page Widget 2.0. By default, the widget will allow Pages and Posts to be featured.

fpw_post_types_filter_examples.php

<?php
/**
 * add a post type that can be featured in the Feature a Page Widget
 * 
 * Any post types added via this filter automatically have support added for excerpts and featured images
 * 
 * This example adds the ability to feature the "book" post type
 * 
 * @param	$post_types	array	array of post_type slugs that can be featured with the widget
 */
add_filter( 'fpw_post_types', 'fpw_add_post_type_to_feature' );
function fpw_add_post_type_to_feature( $post_types ) {
	$post_types[] = 'book';
	return $post_types;
}
 
/**
 * remove a post type that can be featured in the Feature a Page Widget
 * 
 * This example removes the [now default] ability to feature the Post post type
 * 
 * @param	$post_types	array	array of post_type slugs that can be featured with the widget
 */
add_filter( 'fpw_post_types', 'fpw_remove_post_type_to_feature' );
function fpw_remove_post_type_to_feature( $post_types ) {
    return array_diff( $post_types, array( 'post' ) );
}