[Koha] restrictions / not_loan

Hi, I'm trying to figure out a couple of things a) we want to have a certain type of patron who can borrow books that are normally "not for loan" can i do that by making this a staff patron and then catalog a book as a NOT_LOAN value 2? b) what exactly are the restrictions in 952$5 and how exactly are they used? I've tried looking for solutions in the koha book from packt but i have found the book very impractical for things like that. The online manual lists the values (-1/0/1/2 for NOT LOAN) but does not state what exactly the value 2 means (other than "staff collection") thanks! Klaas