In a deep skillet, pour in the oil over medium heat. (It should reach 1 1/2 inches up the side of the pot).
Meanwhile, in a large bowl, combine 2 cups pancake mix, 1 1/4 cups water, and 6 tsp hot sauce. Place the remaining 1/2 cup pancake mix in a wide bowl. Arrange the batter and the bowl of reserved pancake mix near the stove. Line plate with a few paper towels and keep within reach.
Once the oil is heated, toss the chicken pieces with the remaining 2 tsp hot sauce, then toss them in the dry pancake mix, coating evenly and shaking off the excess. Working in 3 or 4 batches, add the chicken to the batter and toss with your fingers or a fork. Remove from the batter, shaking off the excess, and carefully add to the hot oil. Fry the chicken, turning once with tongs, until deep golden brown about 4 minutes. Transfer the chicken to the paper towel lined plate to drain, then season with salt.
Stir the scallions and 1 tsp pepper into the blue cheese dressing. Serve the chicken immediately, with the dressing on the side.