Wikimedia Bugzilla is closed!

I saw on the village pump that this is where I need to go to request features.

I'd like to request a cross referencing search for categories applying simple boolean logic. Examples:

The intersection of Category:A and Category:B (all items in common)
The exclusion of Category:A and Category:B (all items not in common)
The union of Category:A and Category:B (all items)

And I'd like to request some sort of wikilink namespace for doing this, such as [[intersect:A:B]] and support for more than 2 categories to be searched. And an 
option to include subcategories and specify how deep to go.