Not sure how hard this would be to implement, but one thing I would be interested in for a future release is the flexibility to fix certain camera calibration parameters while allowing the others to vary. Rather than the fixing all of them or none of them. Based on some of the photogrammetry texts/literature fixing certain parameters, usually at zero,could be advantageous for some applications.
Or if there's a possibility of work around through the API, I would be open to that too.
Thanks,
James