A. When the disc is released, a player must:
(1) Have at least one supporting point that is in contact with the playing surface on the line
of play and within 30 centimeters directly behind the marker disc (except as specified in
803.04 E); and,
(2) have no supporting point contact with the marker disc or any object closer to the hole than the rear edge of the marker disc; and,
(3) have all of his or her supporting points in-bounds.
What about just adding "clearly" to each of the above parts of the rule?
I'm thinking this would effectively put the onus on the jump putter (where I believe it belongs) to perform the putt in such a way that makes it completely and obviously legal to his card mates. The grey area putts would become stance violations. If it's too close to call, it's a stance violation.
In addition, I'd add jump putting without stating one's intention to do so subject to the courtesy violation rule. Just list it in the rule. That way, one's card mates are informed ahead of time and can watch more closely.