Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Depth
MGTEXTOBJECT_SPLINEMOVE
Parameter: Subdivision
MGTEXTOBJECT_SPLINESUB
Parameter: Shader Indexing
MGTEXTOBJECT_INDEXING
Parameter: Effects
MGTEXTOBJECT_EFFECTORLIST_ALL
Parameter: Axis
MGTEXTOBJECT_AXIS_ALL
Parameter: Effects
MGTEXTOBJECT_EFFECTORLIST_LINE
Parameter: Axis
MGTEXTOBJECT_AXIS_LINE
Parameter: Align Height
MGTEXTOBJECT_AXIS_LINE_ALIGN
Parameter: Effects
MGTEXTOBJECT_EFFECTORLIST_WORD
Parameter: Axis
MGTEXTOBJECT_AXIS_WORD
Parameter: Align Height
MGTEXTOBJECT_AXIS_WORD_ALIGN
Parameter: Effects
MGTEXTOBJECT_EFFECTORLIST_CHAR
Parameter: Axis
MGTEXTOBJECT_AXIS_CHAR
Parameter: Align Height
MGTEXTOBJECT_AXIS_CHAR_ALIGN