dompdf as helper instead of plugin - CI 2.x

[eluser]uk81[/eluser]
Hi guys.

I have a question.
I´m using CI 1.7.x with the dompdf plugin. It was very easy because just putting the third-party code (which comes as a directory with many files) in a directory at /system/plugins/.

Now since Codeigniter 2.0.0 the plugin/ directory was removed. The documentation says:

Plugins have been removed, in favor of Helpers. The CAPTCHA plugin has been converted to a Helper and documented. The JavaScript calendar plugin was removed due to the ready availability of great JavaScript calendars, particularly with jQuery.

So I have to use dompdf as a helper. But where is suggested to put dompdf files, the subdirectories ...?
I think it is not nice to create a directory /application/helper/dompdf/
Or is this what you suggest?

Thanks for your answers!