I'm creating a DIGG like site for my region. Pligg seems like the best solution for it.

I'll have main topics and sub cats...the main topics & subs will span news and happenings in 15 countries.

So I need a way to allow users to display all the news and then if they want, to be able to filter the news/stories by countries as well as by categories & sub-cats. I dont want to create duplicate categories for each country.

Is there any way to do this ?