Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See page_maxonapi_getting_started_foundations_cinema_parameters.
Parameter: Mask Color
MDATA_SCULPTTAG_MASK_COLOR
Parameter: Show Layer Manager
MDATA_SCULPTTAG_LAYERMANAGER
Parameter: Freeze
MDATA_SCULPTTAG_FREEZE
Parameter: Allow Deformations
MDATA_SCULPTTAG_ALLOWDEFORM