I don't care if the pilot I shoot down gets a ditch or a bail or a crash. If I make him loose his plane, it should be a kill credited to me.
I think the kill credit should be awarded to the shooting pilot any time an aircraft (that was shot) is forced to ditch where the airframe would be considered a loss (i.e. wings ripped off, smashed fuse, lost in the forest, etc.) For that matter, if the pilot exits the plane and is not on an airfield, the plane should be considered lost and the shooting pilot should be awarded the kill. That is how it would have been in RL.