The book, Mastering System Center 2012 R2 Configuration Manager,
on page 776 under chapter 17 - Role - Based Administration:
http://www.amazon.com/Mastering-System-Center-Configuration-Manager/dp/111882170X
Quote: "
Full administrator? Oh My!
(...) Users (or groups) who are assigned to this security role hold all the keys to all of the castles in the ConfigMgr 2012 environment. As a result, the number of users or groups who have this security role should be very limited. Because of the power that this role holds, the fewer the administrative users who have this role the better! Also, the organization should periodically review the access requirements for administrative users who hold this role and determine if they can be provided with a less-powerful security role. (...)
"