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Unfortunately, while I was writing a detailed response, I got logged out – thanks to the forum settings 😡. In short, I would still reduce the armies of Sauron and the Witch-king (even though I played for a long time according to the game calendar, their armies were still noticeably larger than mine), I would make the resource event occur not every 7 days, but every 14 days, and I consider the starting 2111 mummies at the brown tent on the southeastern island to be excessive; the Nazgûl did not appear, possibly because the orange tent with the guard of red dragons was never broken through by the time I arrived, and I would also add an additional sulfur mine to the map – this resource is very noticeably lacking when capturing the necromancer's castle and hiring dragons.
Added 1 minute ago
Regarding the map editor, the authors of fheroes 2 promise to create their own over time, but it will have a special format, and the maps created in it will only be launched through fheroes2.