I use 720º, H-shift, clutch, brakes. I'm sure I could squeeze a second if I used paddles, autoclutch, and a smaller wheel lock. One keeps loosing 10ths, because it's more difficult to be exactly precise. And one runs the risk of engaging the wrong gear, sometimes damaging the engine.
But then, it's 100 times more fun. With practice it very posible to get decent times and compete with the best. Another cool advantage is that, at least to me, it's easier to correct small mistakes without suddently biting the dust.
Keep practicing, you won't regret it.