Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Trace Link
MGTRACEROBJECT_OBJECTLIST
Parameter: Tracing Mode
MGTRACEROBJECT_MODE
Parameter: Sample Step
MGTRACEROBJECT_SAMPLESTEP
Parameter: Trace Active
MGTRACEROBJECT_ACTIVE
Parameter: Trace Vertices
MGTRACEROBJECT_USEPOINTS
Parameter: Use TP Subgroups
MGTRACEROBJECT_USETPSUBGROUPS
Parameter: Handle Cloners
MGTRACEROBJECT_MGMODE
Parameter: Include Cloner
MGTRACEROBJECT_INCLUDECLONER
Parameter: Space
MGTRACEROBJECT_SPACE
Parameter: Limit
MGTRACEROBJECT_LIMITMODE
Parameter: Amount
MGTRACEROBJECT_LIMITMODE_AMMOUNT
Parameter: Reverse Sequence
MGTRACEROBJECT_REVERSESPLINE