Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See page_maxonapi_getting_started_foundations_cinema_parameters.
Parameter: Operation
BOOLEANGENERATOR_OPERATIONParameter: Resolve Self-Intersections
BOOLEANGENERATOR_PREPROCESSParameter: High Quality Normals
BOOLEANGENERATOR_HIGH_QUALITY_NORMALSParameter: Intersect Edges
BOOLEANGENERATOR_SELECTION_INTERSECTParameter: BOOLEANGENERATOR_SELECTION_INTERSECT_NAME
BOOLEANGENERATOR_SELECTION_INTERSECT_NAME