In small bowl, combine orange juice, vinegar, honey, garlic, sesame seeds, ginger, dry mustard, and wasabi powder. Gradually whisk in olive oil and sesame oil until well blended. Pour dressing over chilled capellini; toss to coat.
Thread shrimp on six 12-inch skewers. Spray shrimp, red onion slices, zucchini slices, and green onions with cooking spray. Grill vegetables 5 to 10 minutes or until crisp-tender, turning once halfway through grilling time. Grill shrimp 4 to 5 minutes or until pink, turning once halfway through grilling time.
Remove skewers and vegetables from grill. Separate red onion into rings; slice green onions diagonally. Combine pasta, shrimp, red and green onions, zucchini, and tomatoes. Toss well. Season with salt to taste. Sprinkle with dill weed. Serve immediately.