Torque sticks should only be used so you don't overtorque the lugs BEFORE you use a torque wrench. I used to work at discount tire, and that's how I was taught, using a 60 pound stick. Even at that, most idiots working at these places still keep the impact gun on there too long and it still ends up torquing way past 100 ft. lbs. Many many people came back with warped rotors, especially on GMs, and the guys that worked on those particular cars were always like, "but I used the torque stick"
Like someone else posted above, it will still keep spinning the lug nut if you just keep the gun on there clicking and banging against the hex.