1)If you have an unmoved stack, and have an unit join that stack by moving into it and spending all its movement points, the stack still have its full movement point left.
2)In tactical combat if you spend all action points but one, you can still cast spells.
Example: the sovereign has 4 movement points, it moves 1 square, attack 2 times and STILL can cast an healing spell.
3) playing with my custom sov, i am not able to wear purchased items (light plate armor).