Rendering with custom GraphEdit files

[ilpippo]

Would it be possible to add the possibility to use custom graphedit files instead of only letting the users to choose an audio and video filters and the renderer?
I ask this because:
- I'd like to use ffdshow for postprocessing only
- I'd like to use Haali's Video Renderer (included with Haali's matroska splitter), which is the only renderer that gives me the correct 0-255 pc luma range output and that enables hardware deinterlacing at the same time.
Thanks