Thank you for the feedback - I really appreciate it.
Although you should be aware that headless browser will be applicable for different type and depth of web application testing. Certainly execution tests against a headless browser will not comply with the functional testing offered by Test Studio as of now.
Despite the above note here is a feature request
which will be explored by the management and developers teams. Once it is clear what the demand would be for such implementation the item will be updated accordingly.
Thanks once again for sharing your ideas with us!