For problem no1, you could try using required=True instead of 
requires=IS_NOT_EMPTY()

For your second problem you can define the auth_user table yourself (from 
web2py book):

Another way to do this, although not really recommended, consists of 
defining your auth tables yourself. If a table is declared before 
auth.define_tables() it is used instead of the default one. Here is how to 
do it:

## after auth = Auth(db)
db.define_table(
    auth.settings.table_user_name,
    Field('first_name', length=128, default=''),
    Field('last_name', length=128, default=''),
    Field('email', length=128, default='', unique=True), # required
    Field('password', 'password', length=512,            # required
          readable=False, label='Password'),
    Field('address'),
    Field('city'),
    Field('zip'),
    Field('phone'),
    Field('registration_key', length=512,                # required
          writable=False, readable=False, default=''),
    Field('reset_password_key', length=512,              # required
          writable=False, readable=False, default=''),
    Field('registration_id', length=512,                 # required
          writable=False, readable=False, default=''))

## do not forget validators
custom_auth_table = db[auth.settings.table_user_name] # get the 
custom_auth_table
custom_auth_table.first_name.requires =   
IS_NOT_EMPTY(error_message=auth.messages.is_empty)
custom_auth_table.last_name.requires =   
IS_NOT_EMPTY(error_message=auth.messages.is_empty)
custom_auth_table.password.requires = [IS_STRONG(), CRYPT()]
custom_auth_table.email.requires = [
  IS_EMAIL(error_message=auth.messages.invalid_email),
  IS_NOT_IN_DB(db, custom_auth_table.email)]

auth.settings.table_user = custom_auth_table # tell auth to use 
custom_auth_table

## before auth.define_tables()

-- 
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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