For my blogpost http://websupporter.net/blog/de/starter-content-fuer-themes/

starter-content-add-options.php

<?php

add_action( 'after_setup_theme', 'theme_start_content' );
function theme_starter_content() {

	add_theme_support( 'starter-content', array(
		'posts' => array(
			'home',
			'test' => array(
				'post_type'    => 'page',
				'post_title'   => _x( 'Das ist ein Test', 'theme-slug' ),
				'post_content' => _x( 'Hier habe ich eine Testseite angelegt.', 'theme-slug' ),
			),
		),		
		'options' => array(
			'show_on_front' => 'page',
			'page_on_front' => '{{home}}',
			'page_for_posts' => '{{test}}',
		),

		'theme_mods' => array(
			'color' => '#f00',
		),
	) );
}