Cook pasta according to package directions, omitting salt. Add green beans during the last 4 minutes of cooking. Drain. Transfer to large bowl.
Wisk oil, vinegar, thyme, mustard, lemon juice, honey, salt and pepper in medium bowl until smooth and well blended.
Pour dressing over pasta and green beans; toss to coat evenly. Stir in walnuts and cheese. Serve warm or cover and refrigerate until ready to serve. (if serving cold, stir walnuts into salad just before serving.