Province Administration Filter Options

I personally use the province administration tab to build and produce easily, however I have thought that introducing more 'filter options' would make this task even easier. My suggestions include a filter for core and non-core provinces, and a filter for each country invaded. Example, filter provinces by *country*. The game can already filter provinces by large regions, so I guess I'm just saying to make the regions smaller and add non-core/core province filters.

Thanks.