In answer to the final part of the original post, yes, AEG's Empire (by Mike Mearls) addresses these notions in part. He ignores the rape part.
The Mass Combat rules address supply for units, and talk about making foraging checks to feed the unit. This takes place at a high level, though, and so the effects on the local farmers are not addressed; just the effect of a lack of supplies on the military units.
Among the Realm actions is "Sack Enemy Lands", which essentially turns your soldiers loose to plunder a Castle/City/Town/Village that they have conquered. You gain some money in the looting, and the enemy stronghold is destroyed.
The Mass Combat rules address supply for units, and talk about making foraging checks to feed the unit. This takes place at a high level, though, and so the effects on the local farmers are not addressed; just the effect of a lack of supplies on the military units.
Among the Realm actions is "Sack Enemy Lands", which essentially turns your soldiers loose to plunder a Castle/City/Town/Village that they have conquered. You gain some money in the looting, and the enemy stronghold is destroyed.