Yeah, that's kind of what I was thinking. I'm not sure about the other divisions (I imagine A would be even worst) but I know C div on Sat night between 10-12 when I was keeping score there were games ending all the time and people were anxious to get back on. So even with 3 scorekeepers covering 12 games it would be tough to always keep an eye on JQ or whatever in the event of a double roll.
If you are on ball 3 or 4 or even 5 and you have 150k raising your hand and notifying someone wouldn't have been that tough. We prided ourselves ( or tried) to make sure people only had to wait ~10-15 secs (tried to be as fast as possible) to get a scorekeeper. I was watching to see when games were ending or had ended and popped up while bonus counted down to get them out and re-qued ASAP. So I think it was possible to just say something.
But in the end the rule says a player needs to notify the TD. Thanks!