what he said
sortinfo is an "almost" dead project. I looked into using it's data originally, but the format was bad and there isn't a direct interface for other programs to use it. This is why there aren't a whole lot of fes using it or it's data. All the good fes (read all the fes discussed on byoac) support filtering of some sort. Btw you can do button/trackball filtering on mine just incase it's absolutely necessary.