Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Mask Color
MDATA_SCULPTTAG_MASK_COLORParameter: Show Layer Manager
MDATA_SCULPTTAG_LAYERMANAGERParameter: Freeze
MDATA_SCULPTTAG_FREEZEParameter: Allow Deformations
MDATA_SCULPTTAG_ALLOWDEFORM