I've always thought the ditching/landing rules were far too stringent. Let's face it, most forward combat airfields were little more than flattened dirt strips and even grassy field areas in some cases. I have always though that ending a mission in anything should be considered landing if it's within the area of a circle that extends from the far edge of the town to the far edge of the field with perhaps a 1k yard margin around the circle. It just doesn't make any sense to be sitting next to your hanger or whatever and not be considered landing safely simply because you happen to not come to rest on a 'paved' area. Heck up until a year ago, we could even land safely at ENEMY fields, I think the restrictions should be loosened at or near friendly fields.
Zazen