Settings::getPageConfig() 

\nn\t3::Settings()->getPageConfig($tsPath = '', $pid = NULL); 

Get page configuration

\nn\t3::Settings()->getPageConfig();
\nn\t3::Settings()->getPageConfig('RTE.default.preset');
\nn\t3::Settings()->getPageConfig( $tsPath, $pid );
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Also exists as ViewHelper:

{nnt3:ts.page(path:'path.to.pageconfig')}
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| @return array

Source Code 

public function getPageConfig( $tsPath = '', $pid = null )
{
	$pid = $pid ?: \nn\t3::Page()->getPid();
	$config = \TYPO3\CMS\Backend\Utility\BackendUtility::getPagesTSconfig( $pid );
	$config = \nn\t3::TypoScript()->convertToPlainArray( $config );
	return $tsPath ? $this->getFromPath( $tsPath, $config ) : $config;
}
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