I think a dual standard would be good enough.
* pitch angle/altitude limitation for the known "level buffs"
(excluding the Ju88A, which was capable of dive bombing)
* perk system for heavy ordnance such as 2x1000lbs
(pretty rare in real life, as many people pointed out)
It seems with the 30 second idea, HT's trying to solve two problems with one.. but as much of us would agree on, this sort of limitation is way too much.
The limitations on bombing according to the pitch angle would effectively force people away from "the ends justifies the means" behavior shown against targets like CVs(kind of makes you feel stupid grabbing a SBD Dauntless and performing the precision drop technique you practiced so hard to master... when any idiot with 3000~4000 feet alt can knock out a CV with Lanc formations with a bomb load equivalent of 21 jabo fighters..)...
..and the perk system for 1000lbs/500kg load out, (I believe Karnak suggested this first, way back..) is brilliant. It gives alternate use and reason for stacking up points, and also, seeing how just 8 points effectively ended the CHog scourge, even a meager 3~5 points on 1000lbs loadouts will make the jabo folk think twice before joining the typical "cram 20 Typhs to one field and close it any way you can.." situations we've been witnessing last few months. With the 1000lbs loadout far less common, it will need deadly precision to close down target fields.
..
What I'm torn about is the instances of low altitude level bombings.. such as Lancasters passing over a field at 3k... I'm not sure how to look at this one.. because while it does bring a frown to my face, I'm not sure if this is exactly an unprecedented case in real life, nor if there is any real reason to stop this sort of bombing method.