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Sigma lens correction profiles


Just ordered a Sigma 14-24/2.8 DN for my S1R. Looking through the Panasonic manual I can't find any reference to lens profiles. Wondered if anyone knew answers to following:

1. Presumably the baked in lens profile for digital correction of distortion, vignetting, coma etc is automatically enabled - is there a way to turn this off in camera or only with Sigma FP?

2. I haven't checked yet but presume there is a lens correction profile in PhotoLab 4 for the 14-24/S1r combination - could this overcorrect or does it take the Sigma "in-lens profile as a starting point?

3. Is it possible to install Sigma lens firmware updates via Panasonic S bodies or do you have to get the Sigma USB hub?