Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See page_maxonapi_getting_started_foundations_cinema_parameters.
Parameter: Override Phong Tag
MDATA_PWS_OVERRIDE_PHONG
Parameter: Phong Angle
MDATA_PWS_ANGLE_THRESHOLD
Parameter: Use Edge Breaks
MDATA_PWS_USE_PHONGBREAKS
Parameter: Select All
PWS_BTN_SELECT_ALL
Parameter: Tag Name
PWS_TAG_LINK
Parameter: Auto Set Selection
PWS_TAG_AUTO_SET_SEL
Parameter: Set Selection
PWS_TAG_SET_SEL
Parameter: Add Selection
PWS_TAG_ADD_SEL
Parameter: Subtract Selection
PWS_TAG_REM_SEL