Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Direction
HAIR_TOOL_COMB_DIRECTION
Parameter: Strength
HAIR_TOOL_COMB_STRENGTH
Parameter: Spline
HAIR_TOOL_COMB_SPLINE
Parameter: Texture
HAIR_TOOL_COMB_SHADER
Parameter: Curve
HAIR_TOOL_COMB_CURVE
Parameter: From Root
HAIR_TOOL_COMB_FROMROOT
Parameter: Prevent Intersection
HAIR_TOOL_COMB_INTERSECT
Parameter: Geometry Weighting
HAIR_TOOL_COMB_WEIGHTED
Parameter: Weight
HAIR_TOOL_COMB_WEIGHT
Parameter: Limit
HAIR_TOOL_COMB_LIMIT_DISTANCE
Parameter: Distance
HAIR_TOOL_COMB_DISTANCE