Customize Date/Time title for Final Cut Pro X
The reason the one from Final Cut Pro doesn't have the "Region" control is because it has the "Animate" flag set. If you set the animate flag on yours, then select something else, and then select yours again, the Region setting goes away. I don't know if that's a bug or if there's some user interface design reason for it. 

So if you want to change the region, I suggest turning on the animate flag, select something else, select the generator again and set the region. Then turn the animate flag off again. I'm not sure if it will take or not, but I bet it would.