Coat the inside of the crock with butter-flavored or olive oil nonstick cooking spray. In the crock, combine the mustard, olive oil, salt, black pepper, and cayenne with a spoon. Add the wings to the crock and toss to coat with mustard mixture. Spray the wings lightly with some cooking spray. Cover and cook on HIGH for 2 to 3 hours. If possible, stir gently halfway through the cooking time, bringing the bottom wings to the top.
Combine the dipping sauce ingredients in a microwave-safe bowl. Microwave on HIGH for 2 minutes to melt the brown sugar and preserves.
Serve the wings hot with the warm dipping sauce on the side.