samba-specific question about attribute generation

[charlie derr <cderr@simons-rock.edu>]

In our ldap, we have people who are in the following objectclasses

top
person
inetOrgPerson
posixAccount
shadowAccount
customObjectClass:

by doing a comparison of the exported .ldif files from a (test) person's 
entry before and after using 'smbpasswd -a' on a machine that is 
configured to make those changes back into the directory (instead of in 
the smbpasswd file) i discover that


in addition to
objectclass:  sambaAccount

i also have the following attributes

rid:
displayName:
primaryGroupID:
logonTime: 0
acctFlags: [UX         ]
logoffTime: 2147483647
kickoffTime: 2147483647
pwdLastSet: 1043292599
pwdCanChange: 0
pwdMustChange: 2147483647


I'm trying to build a php page that will promote a user to objectclass: 
sambaAccount -- my question is:  Can I just populate those attributes 
with the above default values?  DisplayName can be generated from cn or 
gecos.   PrimaryGroupID can be chosen according to custom attributes 
that i have defined (and populated). Do i need to use a specific 
algorithm for generating an rid? Or can I just pick from a range of 
available numbers?

   thank you very much in advance for your time,
       ~c