Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Projection
ID_CA_WEIGHT_TOOL_PROJECTIONParameter: Visible Only
ID_CA_WEIGHT_TOOL_VISIBLE_ONLYParameter: Selected Only
ID_CA_WEIGHT_TOOL_SELECTEDParameter: Auto Normalize
ID_CA_WEIGHT_TOOL_NORMALIZEParameter: Mode
ID_CA_WEIGHT_TOOL_MODEParameter: Strength
ID_CA_WEIGHT_TOOL_STRENGTHParameter: Curve
ID_CA_WEIGHT_TOOL_SPLINEParameter: Falloff
ID_CA_WEIGHT_TOOL_FALLOFFParameter: Pressure
ID_CA_WEIGHT_TOOL_PENParameter: Radius
ID_CA_WEIGHT_TOOL_RADIUSParameter: Width
ID_CA_WEIGHT_TOOL_WIDTHParameter: Hardness
ID_CA_WEIGHT_TOOL_HARDNESSParameter: Curve
ID_CA_WEIGHT_TOOL_FALLOFF_CURVEParameter: Clamp
ID_CA_WEIGHT_TOOL_CLAMP_LOWER_ENABLEParameter: Lower
ID_CA_WEIGHT_TOOL_CLAMP_LOWERParameter: Clamp
ID_CA_WEIGHT_TOOL_CLAMP_UPPER_ENABLEParameter: Upper
ID_CA_WEIGHT_TOOL_CLAMP_UPPERParameter: Enable
ID_CA_WEIGHT_TOOL_SYMMETRYParameter: Mode
ID_CA_WEIGHT_TOOL_SYMMETRY_MODEParameter: Search
ID_CA_WEIGHT_TOOL_SYMMETRY_RADParameter: Left
ID_CA_WEIGHT_TOOL_SYMMETRY_MODE_NAME_LEFTParameter: Right
ID_CA_WEIGHT_TOOL_SYMMETRY_MODE_NAME_RIGHTParameter: Coord
ID_CA_WEIGHT_TOOL_SYMMETRY_COORDParameter: Mirror
ID_CA_WEIGHT_TOOL_SYMMETRY_MIRRORParameter: Object
ID_CA_WEIGHT_TOOL_SYMMETRY_COORD_CUSTOM_OBJECTParameter: Display Weighting
ID_CA_WEIGHT_TOOL_ENABLE_DISPLAYParameter: Draw Falloff
ID_CA_WEIGHT_TOOL_DISPLAY_FALLOFFParameter: Draw Outline
ID_CA_WEIGHT_TOOL_DISPLAY_CURSORParameter: Falloff While Painting
ID_CA_WEIGHT_TOOL_DISPLAY_MOUSEINParameter: Cursor Color
ID_CA_WEIGHT_TOOL_DISPLAY_CURSOR_COLORParameter: Falloff Color
ID_CA_WEIGHT_TOOL_DISPLAY_FALLOFF_COLORParameter: Erase Color
ID_CA_WEIGHT_TOOL_DISPLAY_ERASE_COLOR