[Alneyan]

One of these suggestions is partially already in the game. A spell (or perhaps a few spells) allows you to promote a regular unit into a Commander. (Gift of Reason, level 4 Thaumaturgy, needs 4 in Nature)

I would be reluctant to call some of the other changes "improvements", as they could lead to many problems on their own. (I am especially thinking of the several Gods suggestion among others)