By checking ListingFeatureDetails on site ID 0 (US), here's the response:
It seems only "BoldTitle" is allowed on ebay US.
Even with Free expedited shipping offered (UPS 3 day), our listings don't come with the green bold style.
So the question is: How to enable the green bold style for shipping, via the API call "AddFixedPriceItem"?
Thank you for your time.