In the latest tournaments (orginized by me) the following rule have been used, have explained it a couple of times when asked and that is how we have played it.
11. SNAP SHOT: Not allowed across Walls/Hedges/Crest Line etc, ask TD that can explain the rule clarification (change?), in less than one minute, in simple terms, if a Snap Shoot is allowed or not (working on a re-wording/-written of rule A8.15).
Tournament Directors from Borås and Copenhagen have asked if I could write down a House Rule for the tournament, that they may use themselves and perhaps even in America.