Nice post by Richard Hicks on when you can use the TMG component that is installed on the UAG server.
While most of the time you’ll hear that you should never touch the TMG that sits under the UAG deployment, there are a small collection of scenarios where putting some elbow grease into the TMG console on the UAG server is a good thing.
Richard calls out these scenarios in his blog post at:
DEBRA LITTLEJOHN SHINDER
MVP (Enterprise Security)