I favor right hand for torch holding, as well as right foot for pedal control (most like modulating a gas pedal, I suppose.) Although can reverse sides as needed. Not afraid to use the torch switch in 2T mode with about 2 seconds of downslope, repeatedly triggering on/off allows manually (and continuously) varying the average current output / "duty cycle" without letting the arc go out or getting restarts.

Now of course, using the torch switch isn't going to allow you to have any hope of pulling of tricks like fusing together filler rod stubs, which are easily pulled off when using the pedal. But with some experimentation and setting an appropriate "peak amp" setting on the machine, there is a lot that one can pull off with a torch switch.