Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Strength
ETPARAMETERTAG_STRENGTHParameter: Reset
ETPARAMETERTAG_RESETParameter: Mode
ETPARAMETERTAG_MODEParameter: Hide Unchanged
ETPARAMETERTAG_HIDEUNUSEDParameter: Sample Point Mode
ETPARAMETERTAG_FIELDPOINTParameter: Fix Position
ETPARAMETERTAG_FIXPOSITIONParameter: Fields
ETPARAMETERTAG_FIELDS