Experiments in skipping the main WP query

gistfile1.php

<?php

add_action( 'setup_theme', function () {
	global $wp;

	class RM_FakeWP extends WP {
		public $skip_query = false;

		function main($query_args = '') {
			$this->init();
			$this->parse_request($query_args);
			$this->send_headers();

			if ( ! $this->skip_query ) {
				$this->query_posts();
				$this->handle_404();
			}
			else {
				$this->build_query_string();

				global $wp_the_query;
				$wp_the_query->init();
				$wp_the_query->query = $wp_the_query->query_vars = wp_parse_args( $this->query_vars );
				$wp_the_query->posts = array();
				$wp_the_query->request = 'SELECT FROM nonexistent WHERE 0=1';
				$wp_the_query->parse_query();

				$fake_post = new WP_Post( new stdClass );
				$fake_post->filter = 'raw';
				$wp_the_query->posts = array( $fake_post );
				$wp_the_query->post_count = 0;
				$wp_the_query->post = $fake_post;

				$GLOBALS['post'] = $fake_post;
			}

			$this->register_globals();

			/**
			 * Fires once the WordPress environment has been set up.
			 *
			 * @since 2.1.0
			 *
			 * @param WP &$this Current WordPress environment instance (passed by reference).
			 */
			do_action_ref_array( 'wp', array( &$this ) );
		}
	}

	$wp = new RM_FakeWP();
	$wp->skip_query = apply_filters( 'rm_skip_main_query', false );
} );