Neil, I have to agree with Simon. The car will push like crazy then snap in. I've tried spools in the past but never for long.
If you can drive a car with permenant 4wd it'll probably be the quickest way around (as a rallycross driver you should be able to cope fine), if you want the car to feel a bit more like a 2wd buggy then throw in the one-way.
What I think the FS would really benefit from is a centre one-way. Not the easiest thing to engineer but I'm working on it, maybe have a few in time for the Petit race ... think it would be a worthwhile item around there
