Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Mode
CACHE_TOOL_MODE
Parameter: Show +/-
CACHE_TOOL_SHOW_RADIUS
Parameter: Frames +/-
CACHE_TOOL_FALLOFF_RADIUS
Parameter: Strength
CACHE_TOOL_FALLOFF_STRENGTH
Parameter: Falloff
CACHE_TOOL_FALLOFF_MODE
Parameter: Width
CACHE_TOOL_FALLOFF_WIDTH