What's the problem with some scorched earth strategy? Thinking like a hopeless Lord losing his region, I certainly would not leave food for my enemies... or gold in the temples... I would go to the extremes of destroying the fortifications and recruitment centers, rocket-launch the taxes to the heights and cause as much damage as possible.
It is not as if historically this has never been done before...
The problem is simply that the game doesn't reasonably account for either the access to implement, nor the reaction of the peasants to such a strategy.