[Zope] User and UserFolders

Hi, I am currently developing a new product for my company using Zope. No I am running into a problem. I like to use the building user management and user auth features, but I also need add to some new properties to a user record. Nothing big just a few properties, that a relevant for some user specific configuration parameters. Can I add new properties to an User object, or do I have to create a new UserFolder and new User object using ZClasses? The later wouldn't be very satisfying. Or can I just create my own type of user and add it to any user folder? Especially the buildin user folder of Zope? Bye, Oliver Andrich