Along a similar thought process.....
We've got a husband/wife that play on our APA league, and they're great people. He's a 6, and she's a 3/4, floats up and down a bit. When the games are close, and she has a critical shot, they call a time out and he kneels behind the object ball while she is down in position, and he has her adjust her cue position until she is locked on for that shot. Then he moves away and she strokes forward and shoots. It works amazingly well for them, and it is quite frustrating for the opponent. It's legal when you can call a time out and coach, but not well received by lots of the other 3s and 4s in the league.
We've got a husband/wife that play on our APA league, and they're great people. He's a 6, and she's a 3/4, floats up and down a bit. When the games are close, and she has a critical shot, they call a time out and he kneels behind the object ball while she is down in position, and he has her adjust her cue position until she is locked on for that shot. Then he moves away and she strokes forward and shoots. It works amazingly well for them, and it is quite frustrating for the opponent. It's legal when you can call a time out and coach, but not well received by lots of the other 3s and 4s in the league.