Include original TAGS and my own tag?

I needed to add some custom fields, we are migrating form feedwordpress to wp-rss-aggregator. The feedwordpress plugin has the ability in the admin to add custom post meta by definig keys and XML path variables for populating the data – very simple.

To reproduce this i added two filters to the feed-to-post plugin which allow me to 1) add post_exerpt and two to add post_metadata.

wprss_ftp_converter.php from line 170 now looks like this:

/*==============================================
		 * 3) CREATE THE POST
		 */
		$post = array(
			'post_title'		=>	$post_title,
			'post_content'		=>	$post_content,
			'post_date'			=>	$post_date,
			'post_date_gmt'		=>	$post_date_gmt,
			'post_status'		=>	$post_status,
			'post_type'			=>	$post_type,
			'post_author'		=>	$post_author,
			'tags_input'		=>	implode( ', ' , $post_tags ),
			'comment_status'	=>	$post_comments
		);

		$post = apply_filters('wprss_ke_modify_post', $post);

		/*==============================================
		 * 4) INSERT THE POST
		 */
		if ( defined('ICL_SITEPRESS_VERSION') )
			@include_once( WP_PLUGIN_DIR . '/sitepress-multilingual-cms/inc/wpml-api.php' );
		if ( defined('ICL_LANGUAGE_CODE') )
			$_POST['icl_post_language'] = $language_code = ICL_LANGUAGE_CODE;

		// check for multisite option - and switch blogs if necessaray
		$switch_success = FALSE;
		if ( WPRSS_FTP_Utils::is_multisite() && $post_site !== '' ) {
			global $switched;
   			$switch_success = switch_to_blog( $post_site );
		}

		// Insert the post
		$inserted_id = wp_insert_post( $post );

		if ( !is_wp_error( $inserted_id ) ) {

			if ( is_object( $inserted_id ) ) {
				if ( isset( $inserted_id['ID'] ) ) {
					$inserted_id = $inserted_id['ID'];
				}
				elseif ( isset( $inserted_id->ID ) ) {
					$inserted_id = $inserted_id->ID;
				}
			}

			if ( $user === NULL ) {
				WPRSS_FTP_Utils::log( 'Failed to determine a user for post #$inserted_id', $error_source );
			}

			// Update the post format
			set_post_format( $inserted_id, $post_format );

			if ( function_exists( 'wpml_update_translatable_content' ) ) {
				if ( $post_language === '' || $post_language === NULL ) {
					$post_language = ICL_LANGUAGE_CODE;
				}
				wpml_update_translatable_content( 'post_' . $post_type, $inserted_id, $post_language );
				/*
				global $wpdb, $sitepress;

				if ( !is_wp_error( $inserted_id ) && class_exists( 'SitePress' ) ) {
					$trid = wpml_get_content_trid( 'post_'. $post_type, $inserted_id );

					$wpdb->insert(
						$wpdb->prefix . 'icl_translations',
						array(
							'element_type'			=> 'post_'. $post_type,
							'element_id' 			=> $inserted_id,
							'trid'					=> $trid,
							'language_code'			=> 'en',
						),
						array( '%s', '%d', '%d', '%s' )
					);
				}*/
			}

			/*==============================================
			 * 5) ADD THE POST META DATA
			 */
			$thumbnail = '';
			if ( $enclosure = $item->get_enclosure() ) {
				$thumbnail = $enclosure->get_thumbnail();
			}

			$wprss_postmeta = array(
					'!wprss_item_permalink'		=>	$permalink,
					'feed_source'				=>	$source,
					'media:thumbnail'			=>	$thumbnail,
					'import_date'				=>	time(),
				);

			WPRSS_FTP_Meta::get_instance()->add_meta(
				$inserted_id,
				$wprss_postmeta
			);

			apply_filters('wprss_ke_add_meta', $item, $inserted_id);

			/*==============================================
			 * 6) ADD THE TAXONOMY TERMS
			 */