That would be abused extensively
There must be a way to discourage Bomb-n-Bail. Though, after my first go I'm stuck - in reality these are just suicide missions, so the stipulation of bailing from undamaged bombers may not have the intended effect anyway. The suiciders would be as happy going in at low level and taking so much damage the bombers are destroyed, as long as they get the bombs on target beforehand.
Remember when (maybe its still this way?) you dropped a torp at a ship, if your plane was shot down before the torp struck, the torpedo was eliminated along with your destroyed aircraft?
Maybe the target damage could be put on a timer - and if your aircraft is destroyed (or you bail) before the timer ends, the damage done by the bombs is all cancelled?