This forum is intended for Support with the Eye SDK only. Any issue or queries related to the Tobii Pro range of hardware
or software needs to be directed to their dedicated support department @ http://www.tobiipro.com/contact/contact-support/
However, perhaps you are indeed using the Gaze SDK and only referred to Tobii Studio for reference? In any event, I am afraid the entire calibration routine and process is handled by the EyeX engine and not something open to modification.
If you are though using the Tobii Pro Analysis SDK, then indeed you should be able to customise to your wishes.