in a small bowl mix the salt, pepper, crushed red pepper and sugar. on a large rimmed baking sheet rub the seasoned salt all over the ribs and let stand for 2 hours.
preheat oven to 300 degrees. in a large roasting pan mix the ginger beer, rum, brown sugar and soy sauce. add the ribs and cover tightly with foil. braise the ribs in the oven for 1 1/2 hours until tender. the the ribs halfway through cooking.
light a grill or preheat the broiler. transfer the ribs to a cutting board-reserve the cooking liquid. cut the racks into individual ribs. grill over moderate heat or broil, turning them until lightly charred on all sides, about 3 minutes. dip ribs in reserved liquid, transfer to a platter and serve.