Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: File Format
FBXEXPORT_FBX_VERSIONParameter: As Text File
FBXEXPORT_ASCIIParameter: Cameras
FBXEXPORT_CAMERASParameter: Lights
FBXEXPORT_LIGHTSParameter: Splines
FBXEXPORT_SPLINESParameter: Instances
FBXEXPORT_INSTANCESParameter: Selection Only
FBXEXPORT_SELECTION_ONLYParameter: Global Coordinates
FBXEXPORT_GLOBAL_MATRIXParameter: Subdivision Surface
FBXEXPORT_SDSParameter: Triangulate
FBXEXPORT_TRIANGULATEParameter: Normals
FBXEXPORT_SAVE_NORMALSParameter: Vertex Colors
FBXEXPORT_SAVE_VERTEX_COLORSParameter: Vertex Maps to Vertex Colors
FBXEXPORT_SAVE_VERTEX_MAPS_AS_COLORSParameter: Up Axis
FBXEXPORT_UP_AXISParameter: Flip Z Axis
FBXEXPORT_FLIP_Z_AXISParameter: Tracks
FBXEXPORT_TRACKSParameter: Bake All Frames
FBXEXPORT_BAKE_ALL_FRAMESParameter: PLA to Vertex Cache
FBXEXPORT_PLA_TO_VERTEXCACHEParameter: Bound Joints Only
FBXEXPORT_BOUND_JOINTS_ONLYParameter: Takes
FBXEXPORT_TAKE_MODEParameter: Material
FBXEXPORT_MATERIALSParameter: Embed Textures
FBXEXPORT_EMBED_TEXTURESParameter: Substances
FBXEXPORT_SUBSTANCESParameter: Bake Materials
FBXEXPORT_BAKE_MATERIALSParameter: Width
FBXEXPORT_BAKEDTEXTURE_WIDTHParameter: Height
FBXEXPORT_BAKEDTEXTURE_HEIGHTParameter: Resize Textures
FBXEXPORT_BAKEDTEXTURE_RESIZEParameter: Format
FBXEXPORT_BAKEDTEXTURE_FORMATParameter: Depth
FBXEXPORT_BAKEDTEXTURE_DEPTHParameter: LOD Name Suffix
FBXEXPORT_LOD_SUFFIX