Any process that modulates the rate, frequency or extent of cell wall macromolecule metabolism. Cell wall macromolecule metabolic processes are the chemical reactions and pathways involving macromolecules forming, or destined to form, part of the cell wall. A cell wall is a rigid or semi-rigid envelope lying outside the cell membrane of plant, fungal and most prokaryotic cells, maintaining their shape and protecting them from osmotic lysis. [ ]