Those table names appear to be hardcoded as default property values with no built-in mutators, but you can probably override Zend_Queue_Adapter_Db to do your bidding. This code is untested, but something like the following:
class My_Queue_Adapter_Db extends Zend_Queue_Adapter_Db
{
public function __construct($options, Zend_Queue $queue = null)
{
parent::__construct($options, $queue);
if (isset($options['queueTableName']) {
$this->_queueTable->setOptions(
array(Zend_Db_Table_Abstract::NAME => $options['queueTableName'])
);
}
}
}
Then just pass a 'queueTableName' property to the constructor. Same principles applies to the _messageTable property.