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For details see here: http://docu.gsa-online.de/search_engine_ranker/macro_guide#random_articlemix_level
I'm about to improve this if someone has a good idea on how the content creation tools work and what they actually do. Right now I have no idea as I don't own one. It's just what I though is useful.
It's available in v6.66 (ohhh scary).