3) Suppose there are users that can register in my site, and there is a
crud of User. But, that's MY User. I mean, User class will have attributes
of MY application. However, I still need a user for Pier, so that to let the
user post, create blogs, etc....How can I do this?
this one is trickier i think. I have overridden WASession and added a user
variable for my user requirements, then in the config screen (in the Web
Browser) there is a place to override the default Session with your own
subclass. In Pier there is a PUUser class but I don't think it so easy to
get Pier to use a subclass, so that may not suit your purposes.