Best Practice for Primary Group?

Does anyone know what the recommended best practice is for assigning users Primary Group in Workgroup Manager? I've been changing them but I've heard that I should leave the default "staff" group (Group ID: 20) and add their user group to the "Other Groups" window. I've heard that: If I do change this Primary Group as I've been doing I could run into problems as Mac's LDAP directory system has the same limitation as Active Directory's spelt out in this article: http://support.microsoft.com/?kbid=275523 What do you do? - have you run into any problems?