1Cook orzo in large saucepan of boiling salted water until tender but still firm to bite, stirring occasionally.
Meanwhile, melt 2 tablespoons butter with oil in heavy large skillet over medium-high heat. Using garlic press, squeeze in garlic; stir 10 seconds. Add shrimp and sauté 2 minutes. Add green onions and toss until shrimp are just opaque in center, about 1 minute longer. Add wine and toss until wine boils, about 1 minute. Mix in remaining 2 tablespoons butter and season to taste with salt and pepper.
Drain pasta; transfer to large bowl. Top with shrimp and onion-garlic butter.