I use a right-handed jammer with a left-foot Pantin, and it seems entirely logical to me to use it that way around. My right leg is stronger than my left anyway, and I find it much more useful to use that as the 'driving' leg in the footloop, and (for me) it's more comfortable when resting on the rope. Also my lifeline connection is way over to the right on my D ring, so it's all nicely separated. Now I've learned how to ropewalk properly (at least up vertical walls), I'm going to get a new model Basic soon to see whether there's any substantial difference in speed/efficiency, but as a right-hander I'd still always prefer a left-foot Pantin no matter what.