It is impossible to foresee everything. The organizers are also people, and people are prone to making mistakes. And in Heroes 4, it's a real mess :) It's impossible to provide a program-automator for all long battles because it doesn't work for all battles, and there is no universal automator. As an alternative to a universal automator, you could use ArtMoney, but this program is officially prohibited :(
Yes, you can plan for it, just don't make the key battles so that they can be automated, and that's it. And why are long battles even needed, it's unclear.
In my opinion, a good map should be interesting, challenging, and dynamic.
Ушел в Аллоды Онлайн!:)