More traffic sectors?

If I didn't get the traffic sectors wrong, it means your FS world is divided into "sectors" for traffic, that way traffic from Japan won't be loaded while flying in NY.Anyways, I was wondering, would there be a way to further divide those traffic sectors? I mean that could give us some more FPS while flying over London or while approaching Heathrow, Gatwick, Luton, Stansted, or London City (that's 4 heavy traffic airports in the same city). Same for Paris I think, with Orly and CDG being two major airports....