If I may contribute my two cents, I will say that on my car, 150" FED, 1/4 turn of the butterfly gets you about 10 degrees of front wheel movement. I would say that is quite quick enough and far enough for any steering inputs you may need to make going downtrack. That's one grip up and one grip down, probably if you need to steer much more than that, you should have been off the gas before you got to that point, or should have corrected earlier. Definitely you should have to pass the grips hand to hand at the turnoff, but definitely NOT going down the track. In any out-of-control situations, well, do what you gotta, do what you can.
But that's just my opinion, I could be wrong...