DeBAAT

Hai,
In case you are interested, I’ve tried to implement it myself using the code below.
Hope you can improve this in a next version of this plugin.
Thanks.
Jan

<?php

// Actions and filters to filter the users
add_action('restrict_manage_users',          array($this, 'vyn_restrict_manage_users')             );
add_filter('users_list_table_query_args',    array($this, 'vyn_users_list_table_query_args')       );

/**
 * Filter the list of users for locked users only
 *
 * @param string $which Whether this is being invoked above ("top")
 *                      or below the table ("bottom").
 */
function vyn_restrict_manage_users( $which ) {
	$id = 'bottom' === $which ? 'new_filter2' : 'new_filter';

	// Check whether to filter or not
	$filter_users = '';
	if ( isset( $_REQUEST['new_filter'] ) && $_REQUEST['new_filter'] == 'vyn_locked_user' ) {
		$filter_users = 'selected="selected"';
	}
	if ( isset( $_REQUEST['new_filter2'] ) && $_REQUEST['new_filter2'] == 'vyn_locked_user' ) {
		$filter_users = 'selected="selected"';
	}
	?>
	</div>
	<div class="alignleft actions">
		<label class="screen-reader-text" for="<?php echo $id ?>"><?php _e( 'Filter user&hellip;', 'vyn' ) ?></label>
		<select name="<?php echo $id ?>" id="<?php echo $id ?>">
			<option value=""><?php _e( 'Filter user&hellip;', 'vyn' ) ?></option>
			<option value="vyn_locked_user" <?php echo $filter_users ?>><?php _e( 'Locked users', 'vyn' ) ?></option>
		</select>
	<?php

	submit_button( __( 'Filter', 'vyn' ), 'button', 'vyn_filter_locked', false );

}

/**
 * Filter the list of users for locked users only
 *
 */
function vyn_users_list_table_query_args( $query_args ) {

	// Check whether to filter or not
	$filter_users = false;
	if ( isset( $_REQUEST['new_filter'] ) && $_REQUEST['new_filter'] == 'vyn_locked_user' ) {
		$filter_users = true;
	}
	if ( isset( $_REQUEST['new_filter2'] ) && $_REQUEST['new_filter2'] == 'vyn_locked_user' ) {
		$filter_users = true;
	}

	// If filter_users is requested, add query_args to filter
	if ($filter_users) {
		if ( empty( $query_args['orderby'] ) ) $query_args['orderby'] = 'ID';
		if ( empty( $query_args['order']   ) ) $query_args['order'] = 'ASC';
		$query_args['meta_key'] = 'theme_my_login_security';
		$query_args['meta_value'] = ';b:1;';
		$query_args['meta_compare'] = 'LIKE';
		//$query_args['meta_key'] = 'admin_color';
		//$query_args['meta_value'] = 'clas';
	}

	return $query_args;
}