Cook couscous according to package directions. Drain, rinse and place in a large bowl. Add bell pepper, snow peas and 2 tablespoons each basil and mint.
Meanwhile, combine cilantro, lime juice, vinegar, water, sambal oelek, ginger, garlic, ¼ teaspoon pepper and salt in a blender. Blend until smooth. With the motor running, slowly drizzle in 4 tablespoons oil. Set aside 2 tablespoons of the dressing. Toss the remaining dressing with the couscous and vegetables to coat.
Heat the remaining 1 tablespoon oil in a large skillet over high heat. Pat shrimp dry and sprinkle with the remaining ¼ teaspoon pepper. Add to the pan and cook, flipping once, until just cooked through, about 2 minutes per side. Serve the shrimp and couscous mixture with the reserved 2 tablespoons dressing and the remaining 1 tablespoon each basil and mint.
