I don't know...I really don't see it making that much of a difference? It's still gonna be a judgement call, and if they want you, they'll have you. They're looking for ways to fine you for about anything anymore anyway. They've had the no jerkdown rule for a while now, back when I was going they had a no jerkdown rule (mid to late 90's). I've seen the no jerkdown enforced on borderline cases, on weaker calves, and I've seen it be pretty much thrown out the window on a pen of stout fresh calves.
The head catch only, meh, it doesn't happen that often with guys that can rope any way, imo. If a guy really needs him caught, like a multiple-go rodeo or average, they'll just get in the middle of him and make it happen. But, that may make you think about the go money and how good you're sitting in the average, just like it does now.
Back then, there was scuttlebutt of pretty much eliminating calf roping east of the MS River. They're still having it in Boston/Wilmington last time I heard.