[web2py] Custom register form with personnalised Auth

[bussiere adrien]

here is my auth table :
(the beginning my table is correct)
db.define_table(
    auth.settings.table_user_name,
   Field('Nom'),
   Field('Prenom'),
   Field('Telephone'),
   # NOte on user is intern and the user don't hve to see it.
   Field('Note on user'), 

How to make a custom sqlform from it ?
like :
def user():
    # i just want some things what is needed (passwd name and all but NOT 
note on user on the form
    form = SQLFORM([auth.settings.Nom,auth.settings.Prenom])
    return dict(form=form)

Regards
Bussiere