Heat the oil and butter in a large saute pan. Add garlic and shallots and saute for 2 minutes over low heat, stirring often. Raise heat to medium, add capers, pimentos, wine, clam juice and pepper; simmer for 2 minutes. Add fillets and simmer over medium-low heat for about 5 minutes. Add shrimp, spreading them evenly over the skillet; simmer for 3 minutes until fillets and shrimp are cooked through. Stir in parsley; add salt to taste. Place fillets and shrimp on pasta on individual plates. Spoon scampi sauce over all and serve.