What would I change in the rules?
1) If you have captured wings, then use them as you wish, without requiring the 5th level of the guild to be built.
As for scrolls, I completely agree, but the restriction should be made even stricter, in addition to the delayed guild, it should not be possible to use them until the 4th week.
I repeat, as an example, maybe we should ban spellbooks altogether?
So you get flight on the 1st week. But what about the mana reserve for using it?
Besides, collecting artifacts by flight is forbidden without breaking through the guards, everyone remembers that, right?
Also, after building 5 levels of the guild, you will be left without resources and without troops.
2) Prohibit specialists in a certain magic from using 4th-level magic against an opponent (against the computer in battle - it is allowed) without building the corresponding level of magic in the castle in the guild.
3) I think that it should be allowed to visit the refugee camp and buy troops there.
There are necessary prohibitions, I have nothing to say about the refugee camp.
4) I think that it is necessary to prohibit Necromancers from upgrading vampires, building a magic amplifier, and choosing a hero at the start (the hero should be random).
As for the amplifier and the ban on choosing a starting hero, I will abstain.
Charity suffereth long, and is kind; charity envieth not; charity vaunteth not itself, is not puffed up,
Doth not behave itself unseemly, seeketh not her own, is not easily provoked, thinketh no evil;
Rejoiceth not in iniquity, but rejoiceth in the truth;
Beareth all things, believeth all things, hopeth all things, endureth all things. Charity never faileth...