MIX first 4 ingredients until blended; set aside for later use. Cook pasta as directed on package, omitting salt.
MEANWHILE, heat oil in large skillet on medium heat. Add shrimp; stir-fry 2 min. Add vegetables; stir-fry 2 min. or until shrimp turn pink and vegetables are crisp-tender. Remove from heat.
DRAIN pasta. Add to shrimp mixture along with the dressing mixture; mix lightly. Sprinkle with nuts.