A completely untested possible way of registering plugins in swift

CommandController.php

<?php

class CommandController {
  $mail = t3lib_div::makeInstance('MyOwnCustomMailMessageObject');
}

?>

MyOwnCustomMailMessageObject.php

<?php

class MyOwnCustomMailMessageObject extends t3lib_mail_Message {

	private function initializeMailer() {
		$this->mailer = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Core\\Mail\\Mailer');
		$this->mailer->registerPlugin(
			t3lib_div::makeInstance('Swift_Plugins_AntiFloodPlugin', 100, 30), 'anti-flood'
		);
	}

}

?>