If the second parameter (setting) is set to 1, the sensor bar from the Wii U GamePad will be enabled.
Any other values will disable it.
Thanks to QuarkTheAwesome for mentioning this on Twitter :)
Added VPADSetTPCalibrationParam, VPADGetTPCalibrationParam, VPADGetTPCalibratedPoint and VPADGetTPCalibratedPointEx.
The VPADData struct is filled completely, no unknown sections are left.