Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Radius
MDATA_SELECTLIVE_RADIUS
Parameter: Pressure Dependent Radius
MDATA_SELECTLIVE_RADIUS_PEN_PRESSURE
Parameter: Only Select Visible Elements
MDATA_SELECTLIVE_VISIBLE
Parameter: Tolerant Edge/Polygon Selection
MDATA_SELECTLIVE_TOLERANT_EDGE
Parameter: Mode
MDATA_SELECTLIVE_MODE
Parameter: Mode
MDATA_VERTEXPAINT_MODE
Parameter: Strength
MDATA_VERTEXPAINT_STRENGTH
Parameter: Pressure Dependent Radius
MDATA_VERTEXPAINT_RADIUS_PEN_PRESSURE
Parameter: Pressure Dependent Strength
MDATA_VERTEXPAINT_STRENGTH_PEN_PRESSURE