In the field that references auth_user you have a requires IS_IN_DB, right? 
that validator can take a format. Example:

Field('foo', 'reference auth_user', requires=IS_IN_DB(db, 'auth_user.id', 
'%(first_name)s %(last_name)s'))

As for the represent not working it's because it's missing an argument:

db.auth_user.id.represent = lambda auth_id, row: row.first_name + ' ' + 
row.last_name

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