As for the magic limit, I hope its usefull, and scaling per level/magic circle, I for one dont like only being able to use my sovereign as the only proper magic user and any other champion its only really "viable" to go for haste/slows. (even tho the spells seems abit unbalanced anyways).
For the monsters to respawn - I hope they firstly make monsters protects theyre nests abit more, I see them often wander 1-2 tiles off, leaving the nest empty for clearing, and I hope it wont flood my "Civlized" lands with weird random spawns far away from any real battles, although if they had a minimum range for cities, meaby even border, can be different per creature too, could be an interesting event to have some minor monsters spawn in your backyard.
Sincerely
~ Kongdej