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

["Robert Zöhrer | pronet.at"]

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.

-- 
regards Robert