Hopefully someone in the community can speak up, in the past 5 years Ive been in the NAC field I have never came across them.
Looking at their docs it shows it has an interal captive portal but I couldnt find anything where it supports external, so you may not be able to use the self reg. You could only do CP auth from their software. You should be able to do MAC cacheing but I dont have any conformation for you.