Nope, I've not seen any closed-loop stepper system other than the Clear path which can do it, and to be honest at the money they want you could get an AC brushless servo which would be much stronger. Thou I'm still not sure they could use a pulse signal to control torque, torque is usually and easily done with +/-10v as MC says. (that said I have some Adtec servos which are pulse only and I think they have torque mode.?, will check that.!)