Stereoscopic adjustments in Resolve 9

I have seen that the Pan and Tilt adjustments are specified in pixels but the convergence seems to be in percentage but not completely : by testing, around the value of 96 in convergence I have the two pictures side to side. If it's a percentage that should be 100. So what is the exact unit of the convergence ?

Is there anyway to keyframe the Auto Process of Stereo Alignment ?

And one more thing : how reinitialize the Auto Process of Stereo Alignment because when it has been calculated I didn't find anyway to do that ?

Regards.
Christophe Reynaud