Hi Kwok,

1 - MetaMod can't filter out results from other modules. That would require some custom PHP coding of the module in question.
2 - This could be achieved by using some PHP code which would load JS code onto the page containing the GeoIP variable values. You would then need to craft your JS to interact with your forms in the appropriate way. e.g. you could do this in MetaMod or Chameleon:

$js = "var geoip_postcode = '" . $geoip->postcode . "';";
$js .= "var geoip_city = '" . $geoip->city . "';";
$js .= "var geoip_country_name = '" . $geoip->country_name . "';";
$js .= "var geoip_postal_code = '" . $geoip->postal_code . "';";
$js .= "// add all your other JS code here that makes use of the geoip variables above and handles the interface for adding these to the form elements, with timeouts etc";

$document = JFactory::getDocument();
if ( method_exists($document, "addCustomTag") ) {
$document->addCustomTag( $js );
}


3 - you can set things up in MetaMod so that it will do a redirect to another page for all IP addresses except some specified ones, like this:

$app = JFactory::getApplication();
if ( $core_genius->check("clientip not startswith 192.168.") )
    $app->redirect("http://www.example.com/errorpage");