It's not hard,
Other sports have these rules, even ones that work inside square ranges with berms in 3 directions. The only difficulty I see is shooting over a target, because of the perception of that from an inexperienced observers point of view might appear farther over the top than it actually is.
As it stands most decisions are left to the MD as the Series does not really get involved in the running of a match only in the management of the scores. I personally think it is a mistake, the series should also manage the shooters too as competitors in their given series.
But if you really wanted to tackle safety on a broad scale you can do it with very little effort.
How about a 10-yard rule, any round impacting +/- 10 yards away from the plate is a stoppage and Stage DQ. Too much, too little, look at the practical application of the rule on a few different ranges, pick a big square range, a small square range and a field course and see what it looks like visually.
Seems like your point is to leave everything alone and just let guys do whatever until something happens that gives the entire industry a black eye.
I mean a quick look 3GUN Nation has rules laid out pretty detailed I am sure they evolved over time, but still look at few that might apply
The capitalized "MUST" was theirs, not mine.
The Abandon rules have a bunch of DQ situations
There is no wiggle room, which is something the PR Crowd tries to avoid, they want their cake and eat it too
We have a ton of other sports in this space to look at and learn from,
More 3GUN Rules
Here is their ND Policy
I personally don't think a guy who misses by 3ft committed an ND but a guy who slips and misses by 3ft committed an ND. Which is really the only gray area and why you need a experienced RO.
Last set of quotes
Why safety is even a discussion is a bit beyond me when you look at how others break down the rules of a shooting game.