New idea..
How about if the bomb destructiveness to field objects drops down to half if the bombs are released under 8k AGL?
That will allow the people to do what they want, but the effectiveness of it all would be downed by half.
So with a deck running B-17 formation armed with 6x1000lbs bombs - each bombs will do only 500lbs of destruction if the drop alt is lower than 8k. Each salvo will drop not 3x1000lbs triangle, but a 3x500lbs triangle.
....
This will drop the overall effectivity of the messy "scatter bombing" by half, and require much more precision.
If for instance, they want to kill all 3xFHs on a small base in one pass deck run with a B-17 formation, their efforts would need to be precise. A 3xB17 formation carries 18k(6000x3lbs) worth of ord. If it is dropped from under 8k, the effectiveness penalty will be half the total worth, so it becomes 9k(3000x3lbs). It is precisely enough to kill all 3xFHs. But only when exact amount of ord is delivered to all 3xFHs - will the hangars go down in one pass.
In the case of the Lancs, a form. carries 42thousand lbs - which when halved, is still 21thousand lbs worth. However, it will still need to time its drop well. Each salvo will be worth 3x500lbs triangle, so the Lanc pilot will have to make sure he has the right delay time and flight path so the 14 salvos are dropped on each of the three FHs in a right amount.
...
So in effect, where one could kill all 3xFHs in a small field in one lame suicidal deck-run pass currently, he'll have to do it twice with the suggested "halvening". If he wants to deliver the full effect of the bombs, he'll have to do it properly.
The "halvening", would rarely take any huge effect when bombing towns or strat objects, since they go down easily enough.
However, it would significantly effect the usefulness of the bombers as a kamikaze deck run crop duster - spraying bombs over vital field objects to get rid of them easily without any real work.