Valter wants to centre a KML map in WP Flexible Map; this plugin will do that for a map with id=kml_centred on a post/page with custom field 'flxmap-centre' that has the centre coordinate. e.g. `[flexiblemap id="kml_centred" src="http://goo.gl/pDG8hl" width="100%" zoom="10" maptype="satellite"]`

flxmap-valter-kml-map.php

<?php
/*
Plugin Name: Flxmap Valter KML map
Description: Valter wants to centre/zoom KML maps
Version: 1
Author: WebAware
Author URI: http://wordpress.org/support/topic/testing-sometimes-it-does-not-work?replies=5#post-5040741
*/

add_action('wp_enqueue_scripts', function() {
    wp_enqueue_script('jquery');
});

add_action('wp_print_footer_scripts', function() {
    global $post;

    if ($post) {
        $centre = get_post_meta($post->ID, 'flxmap-centre', true);
        if ($centre) {
            ?>

            <script>
            jQuery(window).on("load", function() {
                if (window.flxmap_kml_centred) {
                    var flxmap = window.flxmap_kml_centred,
                        map = flxmap.getMap(),
                        centre = new google.maps.LatLng(<?php echo esc_js($centre); ?>);

                    flxmap.setCenter(centre);

                    google.maps.event.addListenerOnce(map, "zoom_changed", function() {
                        map.setCenter(centre);
                    });
                }
            });
            </script>

            <?php
        }
    }
});