A roaming mandatory profile is a read-only user profile stored on a network share that acts as the default template for all users.
Differently from roaming profiles you need consider that all changes made to a roaming mandatory profile are lost upon logoff.
With this approach you can have a customized centralized windows 7 profile
You can go deeper on this argument on official Microsoft Link:
https://msdn.microsoft.com/en-us/library/windows/desktop/bb776892(v=vs.85).aspx
If you like you can review this step by step article with GPO creation explanation too:
https://4sysops.com/archives/create-and-deploy-windows-10-roaming-mandatory-profile/