Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Enable
IRR_ENABLEParameter: Detail
IRR_DETAILParameter: Lock to View
IRR_LOCKTOVIEWPORTParameter: Alpha Mode
IRR_ALPHAMODEParameter: Gadget Overlay
IRR_GADGETOVERLAYParameter: Save...
IRR_SAVE_IRRParameter: Save View...
IRR_SAVE_VIEWParameter: IRR_BITMAP
IRR_BITMAP