I remember a national once at Toddington (circa 1993 i think). Grass track - series opener. Real bad weather. Not many could run for 5 minutes on wide rears and the only way I could get 5 mins at race speed was to fit front full spikes on front wheels on the back.
Tried it after in the dry - thought the car was slightly faster in a straight line due to reduced overall drag but much edgier over bumps - tried it with 2 row studs on the front to really tame things but retain some balance between front / rear.
But that was back in the day when cars raced at pedestrian speeds and we just thought they were quick
My vote would be that it would reduce overall traction levels in normal conditions - perhaps taming the feel of the car in ultra high grip conditions (like removing an outer row). But I wouldn't think of doing it with the rounded profile minispikes as they continue gripping during roll because of their profile.