To be honest, I've never ever felt the effect of this 'bug' with the bomb sight. I admit it could be because of the way how I prefer to bomb, though. I never expect bombs to hit right on marker like some of the pics posted here suggests it should. I always just thought anything hit within about 100 yard radius of the marker is good enough.
So, I put the delay at 0.3 for towns, 0.4 for Vehicle bases, 0.6~0.7 for airfields, and always drop bombs when the bomb marker enters the desired 'area' not desired 'pin-point'.
With this method I've never missed the target I wished hit, since I would effectively bomb everything in the path so eventually the bombs will hit the target. Maybe my method on bombing sort of provides something like 'natural tendency to lead the target a bit' since I look to bomb the whole area, I wouldn't know.
All I know is, from towns to hangars, anything that needs to be taken down I've not missed. The 'bug' somehow doesn't effect me personally.
ps) ....and while many people promote doing the 'mark' process against a target straight below, I still mark on the desired target itself on the horizon. Somehow, this may have an effect, too.