Cook pasta according to package directions, drain. Meanwhile, for sauce, in a small bowl stir together soy sauce, plum sauce, sesame oil and if desired chili paste; set aside.
Pour vegetable oil into a wok or large skillet, heat wok over medium-high heat. (Add more vegetable oil as necessary during cooking). Add sweet peppers and green beans cook and stir for 5 minutes. Push from the center of the wok. Add shrimp, garlic, ginger and black pepper into the center of the wok.
Cook and stir for 2 to 3 minutes or until shrimp are opaque. Stir in sauce and pea pods (if using). Stir in cooked pasta; heat through. Sprinkle each serving with green onions and sesame seeds.