How to manage local Network Prefs for Mobile Account

I have a set-up of OS X 10.4.2 Server and client and I have users that have mobile accounts. These laptops leave the school and are taken home by staff who would like to use the laptop on their own networks, with their own settings. What is the easiest way to give these users access to the Network Prefs without giving them a local administrator account? Whenever the user tries to change the local machines network prefs it asks for the admin account of the local user. (local admin account is used for administering machines only) Is there a way to allow the teachers to change these settings at will through WorkGroup Manager or must I give them a local admin account?? Kind of defeats the purpose of managed client when they have local admin access??? Thoughts? Suggestions?