Jur fitted a Scorcher on the rear of his Brompton, there's a thread about it. I don't think there's any point though, the suspension works great and a scorcher adds weight. On the front IMO it's an improvement. It does mean that the front wheel is closer to the floor when folded (I've got a rack and sometimes the front wheel touches the floor and rotates until the hub gear toggle chain catches on the spokes).