It is, if he's hitting fuel cut on a standard engine, of course there's reason to eliminate fuel cut, otherwise he'll just hit it again and again, till one day when it's going to be one too many. And each car reacts differently to fuel cut, some come earlier, some come later, theres no pinpointing an exact spot where it'll come in, as for a piggyback? Why not? That way he can play about with the mapping, eliminate fuel cut, and have more scope for tuning later on. Damien