Experienced 412 pilots tend to have large right thumbs, from pressing and releasing the interrupt switch repeatedly. I sometimes just keep it pressed down, but get smoother results from pressing it, making a small movement, and releasing it. I never, ever move the cyclic without having the interrupt pressed when in ATT mode. Bell recommends against it, and it seems to confuse the helipilots. I've seen the sim crash when flown against the helipilots. I fly in ATT mode all the time, going to SAS only when on the ground, and I turn the force trim off only for the hydraulics check. Happily, I don't often have to fly a 412 these days.