I'm publishing content with stable URLs so it is important that WordPress always chooses the same category as the base category.
This plugin allows me to set the base category on a per-post basis. What I'm looking for is a way to set it globally, so that certain categories always have preference ('are primary') over other categories.
This is what my category structure looks like:
Volumes > 2009
Volumes > 2008
Volumes > 2007
Topics > Space
Topics > Time
I would like the 'Volumes' categories to always go before 'Topics' categories, so that when something is in 2009 and in Time, the permalink looks like this:
And when it's in 2007 and Space, it should look like this: