For Barbecue Sauce, In Large Saucepan, Saute Onion In Oil Until Tender. Add Garlic; Cook 1 Minute Longer. Stir In The Ketchup, Vinegar, Brown Sugar, Worcestershire Sauce, Chili Powder, Cayenne And Cumin. Simmer, Uncovered, For 8-10 Minutes, Stirring Often. Remove From The Heat; Stir In Pepper Sauce. Set Aside 2/3 Cup For Serving. In A Large Resealable Plastic Bag, Combine The Vinegar, Olive Oil, Salt And Pepper; Add Chicken Wings In Batches And Turn To Coat. Moisten A Paper Towel With Cooking Oil; Using Long-Handled Tongs, Lightly Coat The Grill Rack. Grill Wings, Covered, Over Medium Heat Or Broil 4 In. From The Heat For 12-16 Minutes, Turning Occasionally. Brush With Some Of The Barbecue Sauce. Grill, Uncovered, 8-10 Minutes Longer Or Until Juices Run Clear, Basting And Turning Several Times. Serve With Reserved Barbecue Sauce.