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A mod that balances the AI's strength in campaigns and scenarios would be interesting. Specifically:
1. Increasing the initial bonuses for the AI.
2. Increasing the AI's creature growth rate.
3. Giving the AI heroes stats that are comparable to the player's. Currently, the AI's weak units don't matter because it simply can't put up a fight against the player, even with a hero that's three times weaker.
It would also be interesting to have a mod that balances overpowered spells against the AI in scenarios, specifically Phoenix, Dominate, and Berserk. Or at least, it would be nice if the AI learned how to use them. For example, I've never seen the AI summon a Phoenix, even though its stats would make it a formidable opponent.
Also, the AI rarely uses mass spells from the Darkness and Light magic schools, which I find strange. Even when it has a skilled Darkness mage, it will cast Slow on a single target or just use a Stone Golem. If there's a mod that fixes these issues, I'd be happy to have a link.