You can use "active module menu", in common add this code:
public static function quick_menu() {
return array('Quick menu test'=>array('action'=>'ble'));
}
and in main module you can read this variable with
$this->get_unique_href_variable('action');
Menu definition is the same as in menu method, but variables are passed only to this module - this is why you have to use get_unique_href_variable.