[Grml] Recommended source.list and apt (pinning) setting for HD install?

Before 'grml2hd-utils' could fetch packets (e.g. for multimedia stuff) I had to modify my default? source.list by activating

---------- # MPEG, divx...: deb http://www.debian-multimedia.org sid main deb-src http://www.debian-multimedia.org sid main ---------

in this case.

Because I'm still using default (at installation time) settings for source.list and apt-pinning (preferences)

Question: Is there a recommended way of setting up (and maintain) packet assortment on a grml-HD-installation?

I'm searching for a solution to permanently void packet chaos (maybe) caused by incompatible packet / repository dependencies when using (complex) pinning as it is at grml.