At a maximum bomb release angle of 30° for the Lancaster, nothing much would change in the way they are used and definitely nothing in the complaints about "Lancstukas"
And that is most likely a limit only for one of the large or forward bombs. Like the B-17 that has bomb limits from < 3° up to 55° depending on bomb size and location, as per that manual posted the other day.
I am sure a bomb in the rear of the lancasters very long bomb bay would be able to drop out with a steeper dive then one located at the front.