The offset is definitely useful, but I don’t quite how to do exactly what I want with it: Show ALL categories EXCEPT (offset 4) the most recent posts in a certain category only. If I do:
numberposts=-1&cat=9129&offset=4&orderby=post_date&showposts=10
It offsets the most recent 4 posts in category 9129, but doesn’t show posts in all the other categories. If I just did:
numberposts=-1&offset=4&orderby=post_date&showposts=10
It would exclude the most recent 4 posts regardless of category, which is also not what I want.
I don’t know how else I could use these parameters to achieve what I want.