I'm not a hundred percent sure but I think the way you get root working is to turn on developer settings. I used to use that ROM and I got root working (without SuperSU) but I don't remember exactly how. Try looking some more through settings if you can't find how in developer settings. Also the built in system app remover needs root so once you properly enable root in settings it will work great. If you can't figure it out yourself (getting root working without SuperSU), I can flash the ROM myself to figure out for you. Good luck