.
And I am sure that now Lancasters were used as dive bomber
I don't see it in AH either. I am sure it happens, but a tiny minority of Lanc sorties. Even the low altitude GV carpet bombing is done, in my experience, while flying the Lancaster level.
Honestly, if HTC added the 2k bombs for the P-38L we all know how those would be used. 1) As the Tu-2S has demonstrated 2,000lb ordnance is extremely effective at killing GVs. 2) Two 2,000lb bombs and fourteen 5" rockets would make the P-38L, by far, the most commonly used mass raid of fighter-bombers in the game. 3) Kamikaze attacks by P-38Ls would become more common.
In my opinion we need to shrink the bombs on fighter-bombers, not grow them. Perk 500lb and above bombs on fighters. Say, 1 perk per 500lber/250kger, 3 perks per 1000lber/500kger and 9 perks per 2000lber/1000kger. 250lbers/100kger and rockets would be free.