Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Phase
MBLUR_PHASEParameter: Density
MBLUR_DENSITYParameter: Samples
MBLUR_SAMPLESParameter: Sample Radius
MBLUR_BLURParameter: Weighted Trails
MBLUR_TRAILSParameter: Geometry Deformation
MBLUR_MESHTRACK