Security for SmallWiki

I'd like to have a folder for a particular course. Inside this folder is another folder called "students", and inside this folder is a folder for every student in the class. Let's say there are 40 students in the class, so 40 folders in "students". I want to give each student the ability to administrate his folder, and to keep other students from reading files. It appears to me that the only way to do this is to create 40 roles, one for each student, and to say that role N can administer folder N. This is because roles are defined relative to structures, but users are global. What I'd really like to do is to define a role "owner" and to say that user N has role "owneer" inside folder N, but not in any other folders. However, I don't think this is possible. Any comments? Do I really have to create 40 roles? I suppose I can make an admin action to do this. -Ralph Johnson