Ask a Warrior Thread.

If it's anything like the other classes' Final Attack, it will work for the monsters you hit. I don't believe Final Attack has a range, as long as you hit a target.

Aran's damage dispersal is removed entirely, even if you don't put a point on Cleaving Blows. The updated skill will give you 20% extra damage to bosses.

speaking purely as a DrK here, but my FA does have a range, it's melee range, if i'm up close on an enemy it will trigger, but if not, then it won't. and it only hits one enemy (again, DrK)