On my team we always ask each other.
Shooter shoots ambiguous shot, scorekeeper asks "defense?", shooter answers yes or no. I don't know what the other team's scoresheet is going to say, but I always know ours is accurate.
-Andrew
thats kind of how it is done here. Mainly certain people never seem to have defensive shots marked. Everyone assumes that the lower rated players never miss on purpose.
If anyone rattles the pocket and it doesnt go yet leave the cueball in a tough position for their opponnet I cant mark that a defensive shot. They were honestly trying to make the ball.
As for asking or letting scorekeepers know... how about this one..
In nationals we are playing a team and each time they are going to play a safety they would turn to the scorekeepers and say safe then shoot.
I could not believe that even the ref didnt understand why it was wrong. Even two teams next to us didnt...UNTIL I explained it to them. The ref actually looked like a lightbulb went off in his head when it dawned on him.
They received a sportsmanship warning but they did it a couple more times. Ref warned them again saying a penalty would happen if it continued. Not sure what they would have done.
They were pissed. I just asked them how they would like it if on every shot for the rest of the match my guys lined up and pointed to where he wanted the CB to end up AND then called timeout. I could refuse each time if he was on the right track. They seemed to understand then but still thought what they were doing wasnt hurting.