Sprinkle shrimp with sugar and salt. Combine chili powder, cumin, coriander, and oregano. Lightly coat shrimp with spice mixture.
Heat a large nonstick skillet over medium-high heat. Add 1 teaspoon oil and half of shrimp; sauté 4 minutes or until done. Remove from pan. Repeat procedure with 1 teaspoon oil and remaining shrimp. Place shrimp on a platter; drizzle remaining 2 1/2 teaspoons oil over shrimp. Serve with lime wedges.