Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See page_maxonapi_getting_started_foundations_cinema_parameters.
Parameter: Offset
MDATA_EXTRUDE_OFFSET
Parameter: Offset Variation
MDATA_EXTRUDE_VARIANCE
Parameter: Subdivision
MDATA_EXTRUDE_SUBDIVISION
Parameter: Create N-gons
MDATA_EXTRUDE_CREATENGONS
Parameter: Preserve Groups
MDATA_EXTRUDE_PRESERVEGROUPS
Parameter: Create Caps
MDATA_EXTRUDE_CREATECAPS
Parameter: Maximum Angle
MDATA_EXTRUDE_ANGLE
Parameter: Rotation
MDATA_EXTRUDE_EDGEANGLE
Parameter: Quantize Rotation
MDATA_EXTRUDE_EDGESNAP
Parameter: Angle
MDATA_EXTRUDE_EDGESNAPVALUE
Parameter: Bevel
MDATA_EXTRUDE_BEVEL
Parameter: Bevel Variation
MDATA_EXTRUDE_BEVEL_VARIANCE