If you enable content read workflow using either before_content_read of after_content_read in AvailableOperationList[] instead of content_read, the workflow will not be triggered. This is because of this test in content/view.php:

if ( in_array( 'content_read', $operationList ) )
{
$useTriggers = true;
}
else
{
$useTriggers = false;
}

It should test for content_read or before_content_read of after_content_read instead.