Puppet users - Jun 2013 - Handling users in different environments

Long term we plan to use LDAP or AD, but in the mean time we are 
considering to use puppet.
Most machines only have 3 to 6 users (admins and developers).

My thought was to fully manage new machines and to use puppet to be able to 
disable existing users in pre-existing machines.
Is that a reasonable approach or is it best to do the work get user 
management for now completely under puppet?

I found an "adduser" function so I was planning.
base-node
adduser user-1
....
adduser user-n

for the "fully" managed
The adduser would look like
name    => "First Last",
uid      => "1000",
password => ''Password-hash'',
shell => "/bin/bash",
groups => [''sudo''],
sshkeytype => "ssh-dss",
sshkey => "ssh-key"}

For the "partially" managed was thinking of using a subset of that,
but
when I tried to put the adduser calls in a second base node got an error 
about Duplicate declaration.

The adduser function I am using:
--------------- adduser --------------
define adduser ($name, $uid, $password, $shell, $groups, $sshkeytype, 
$sshkey){

$homedir = $kernel ? {
  ''SunOS'' => ''/export/home'',
  default   => ''/home''
 }

 $username = $title
 user { $username:
  comment => "$name",
  home    => "$homedir/$username",
  shell   => "$shell",
  uid     => $uid,
  gid => $uid,
  managehome => ''true'',
  password  => "$password",
  groups => $groups
 }

 group { $username:
  gid => "$uid"
 }

 ssh_authorized_key{ $username:
  user => "$username",
  ensure => present,
  type => "$sshkeytype",
  key => "$sshkey",
  name => "$username"
 }
}#add
--------------- adduser --------------

The base node
node base-web
{
  include ubuntu-openntpd
  import "../functions/adduser.pp"
}

adduser {user1:
name    => "first last",
uid      => "1000",
password => ''pass-hash'',
shell => "/bin/bash",
groups => [''sudo''],
sshkeytype => "ssh-dss",
sshkey => "key"
}

...
adduser {user-n:
name    => "first last",
uid      => "10##", <--whatever end number
password => ''pass-hash'',
shell => "/bin/bash",
groups => [''sudo''],
sshkeytype => "ssh-dss",
sshkey => "key"
}

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