[Foodstamp]

1) It is probably there. There is no icon for reinvigoration, to check if it is working properly, right click where your fatigue number is listed and it will bring up a subscreen. That subscreen will say "Extra Reinvigoration" or something to that affect listed right under current fatigue. This information may be actually available by right clicking encumbrance, I don't have the game open in front of me atm, but it is one or the other.

2) This is possible sorta. The way to do it is to create an attack with the same attributes as the fireball spell. Give this attack a flysprite and explosion animation that matches what you are trying to achieve and then give that attack to the unit as a ranged attack. Have the units set to fire at enemies and they should use the attack and it will simulate a unit casting fireball. I am fairly certain you can even set the attack to have the same range, precision, damage, aoe etc as the real fireball.