Regarding clumsy hands that seem to grow from the same place as the feet – sometimes even cheats won't help. I once played a map, I think it was called "World Museum," and I placed incredibly powerful armies on the path. I arrived at the territory of an enemy that could be defeated with a single unit, but I couldn't reach him. I looked in the editor – there was a clear path, 2 cells wide, and there didn't seem to be any events or conditions, but in the game, it was like hitting a glass wall...
Справочник по НоММ-4 http://handbookhmm.ru/pamyatka-dlya-heroes-iv.html
Памятка по НоММ-3 http://handbookhmm.ru/pamyatka-dlya-homm-iii.html
и HotA http://handbookhmm.ru/vyishla-obnovlennaya-pamyatka-dlya-homm-iii-hota.html