Hi, I am thinking of implementing a
#CATQUERY <query>
magic keyword for the category pages.
When this keyword is present, the category page would execute a query against the search backend instead of normal category behavior and show result as if those pages were actually marked with this category.
For example, this would allow Greek Philosophers category page to be quickly redefined as a cross-section of greeks & philosophers categories:
#CATQUERY incategory:Greek incategory:Philosopher
Obviously the community will be able to define much more elaborate queries, including the ordering (will be supported by the new search backend)