Sorry jojoepsp I don’t have the answer for you, I am also looking for the answer to this question and also another related to it.
I need the function of bandwidth limiting per user and also a quota. Like 2048 megabytes per time period.
I have attempted to configure these options via captive portal / accounting etc…. however whenever I try to change a user to that accounting class it wont save the changes.
Any help would be great!