It's true, that you can't manually select a specific fixed waveform phase, and then have it to reset to that specific phase.
Also you can't manually change the phases of the different unison OSCs voices.
In Pigments 3 you can reset the phase also in Unison mode though - except for the Supersaw.
But yes you does'nt have parameters, where you manually can select the specific fixed start phase for a engine, for each of the OSCs/ voices added in Unison modes, or for the 3 OSCs in the Analog section. That's a valid request. I also did'nt say, this was possible.
And yes - Reset phase in the Analog section could be a seperate parameter.