Expose PHPExcel caching options

here i see http://phpexcel.codeplex.com/discussions/240375 what phpexcel can use cache

// Initiate cache
 $cacheMethod = PHPExcel_CachedObjectStorageFactory::cache_to_phpTemp;
 $cacheSettings = array( 'memoryCacheSize' => '32MB');
 PHPExcel_Settings::setCacheStorageMethod($cacheMethod, $cacheSettings);

how i can enable it ?

after tests i see what this

function phpexcel_import($path, $keyed_by_headers = TRUE) {
	if (is_readable($path)) {
		require_once 'sites/all/libraries/PHPExcel/PHPExcel.php';
		// Initiate cache
 $cacheMethod = PHPExcel_CachedObjectStorageFactory::cache_to_phpTemp;
 $cacheSettings = array( 'memoryCacheSize' => '4MB');
 PHPExcel_Settings::setCacheStorageMethod($cacheMethod, $cacheSettings);

fix any issues with reading big xlsx files, author can add it to function phpexcel_import and another