The following community resources are valuable in relation to Group Policy:
WindowsServerFeedback.com: So you want to send detailed feedback to the Microsoft Product Group? And you'd like a response too? Use this link to provide that feedback on any Windows Server feature. The more detailed and scenario based the better. If it's for Group Policy use the selection that specifies it is feedback for Group Policy and it will get back to those in Redmond that are responsible for it's development!!!