The first thing I'd do is check this page
and see if any of the available LT settings fit your requirements. If so, you've an easy fix. Otherwise there are only a few ways I know to make this change: click on the local machine to change its settings, use a group policy or make a registry change. I don't figure a LabTech admin would want to do either of the first two options so a registry change is the ticket. This page
will help you determine the registry whats & wheres. Use a LabTech script to make your changes. Please, just as with everything else, test this before running on a customer's machine!
I've personally had good success making Windows desktops do what I need 'em to do using just registry keys. Be aware, some setting changes will require a logout\login before they are realized.