@Alan_Jean You can also create your own config file by creating a file named config.ini and saving it to your desktop (or really anywhere you can find the file).
Here is a complete list of what you can do with the config.ini file:
center-y-as-height-percent = .80
; Changed start point of scan from ground up
You should not need to change the focal or center parameters, unless you got some better calibration parameters using an external calibration tool.