IronAxe
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Well, now I'm waiting for your suggestions... Although, in my opinion, rules 1, 2, and 7 are non-negotiable!
And yet, I suggest making the minimum number of restrictions. List these prohibitions – allow everything else. I'll try to throw in another idea :)
1. Prohibition of using a space to embark and disembark a hero onto a boat. By the way, there's a trick where you can load the same type of units from the shore onto a boat without losing the boat's turn.
2. Prohibition of moving monsters using load-save.
3. Prohibition of elves getting an extra bunch of arrows in battle.
4. Prohibition of digging up the Grail without a fully revealed puzzle map.
5. Prohibition of leveling up a Necropolis on Rogues or on a hero with the "Camouflage" skill – in my opinion, this is no longer relevant, as it has already been fixed.
6. Infinite hero leveling due to map errors. (Once I saw this – near a Fortress, there was an ambush that respawned after it was destroyed again and again).
7. Prohibition of obtaining super-armies.
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???
I believe that the listed points will not cause controversy. Should we add more prohibitions to the list? Suggest them. Regarding hidden ambushes – we can prohibit them, or we can not. We can sometimes alternate this prohibition with its permission. There is also one controversial point regarding Minotaurs. I suggest considering a battle unwinnable if a smaller group of Minotaurs is subjected to attacks more than 2 times in a round, with damage that is incompatible with the survival of this group of Minotaurs.
In other words, a battle of one Minotaur against 21 Creatures (one stack) is allowed to be won, but a battle of one Minotaur against 21 Creatures divided into 7 stacks of three should be considered unwinnable :)
I'll be waiting for clarifications and discussions. Don't put too much pressure on the prohibitions :) You will get tired of studying the rules yourself :) And there's no need to cut out features from the game – it will be more boring to play :)