Move the blood spells under the blood magic tab.

Being able to recruit independents would give some immediate, easy variety for armies.

Spells like those that can only be cast by certain commanders could easily be put under National Spells to avoid cluttering the list.

More national spells in general would help give players options honestly, you can use them to build up choices as well, for example a special site 'Dwarven Ruin' that dwarves have a spell to rebuild into a 'Dwarven hold (Maybe one of a small selection pool, or even each one being unique if you want to go crazy)' which lets you access new units would be a great way to give early goals.

Some of the mis-mash nations really need more of a strong identity, or at least some separation between different groups, as per above if you want a kind of 'confederation of clans' type nation what about having spells that can only be cast by certain commanders which establish 'clan holds' that can be used to recruit members of their race, leading to a bit of a 'how do you spend your resources' type deal (It'd also reduce the number of initially accessible units to de-clutter the capital list. Maybe give some free spawn or commander free spawn?)

Honestly, you've got the foundation for one of the best dominions mods out there at the moment. I'm really curious to see where this goes.