Add a filter inside admin-ajax.php for walker

[dmad]

I'm trying to extend the Wordpress menu system and i can't get the things working from start because inside admin-ajax.php on line 841, there is no filter. I'm talking about this piece of code

if ( ! empty( $menu_items ) ) {
		$args = array(
			'after' => '',
			'before' => '',
			'link_after' => '',
			'link_before' => '',
			'walker' => new Walker_Nav_Menu_Edit,
		);
		echo walk_nav_menu_tree( $menu_items, 0, (object) $args );
	}

The Walker_Nav_Menu_Edit class is applied by default.
If someone can add a filter, it would be great for all developers.