My brother and I the other day were commenting on the increase in national spells announced in Dominions III. We agreed this was a 'good thing'(tm).
My brother then made the suggestion of pretender-specific spells. As an example (this is not part of the request), Nagas have all of these bonuses with Lamias. Why not let the Naga start with Call Lamia? (I can think of quite a few reasons, off the top of my head, but it was a brainstorming session.)
In a similar vein, the Vampire Queen could start with the Vampire-summoning spell.
Then, another thought that crossed our minds was to have pretender-specific Sacred units.
Again, using the Naga as the example. If you choose the Naga as your Pretender, Lamias (and Lamia Queens) are Sacred for you. Vampires could be Sacred for VQs, Ghosts for Ghost Kings, Astral mages for Oracles (
), etc.
Anyway, just a suggestion.
1) Pretender-specific spells.
2) Pretender-specific Sacred troops.