I have not even looked at the expansion rules so I will only weighed in on the stuff I think I know the answer to.
2) What happens to any excess hits if all of an army's front rank units are eliminated? Are these hits ignored or applied to the rear rank?Ignored. In each round of combat the players target one enemy rank.
Finally, and this is more commentary versus a rules question, I am curious about the rules logic in terms of having the active player applying flee results. It seems as though flees will always be applied to the most powerful units to get them off the line. This seems very counter-intuitive - shouldn't the weaker units being the one's more likely to flee. Elite unites, Trolls and Bugbears seem to be the types that would be less likely to retreat in battle but the way the rule reads they are more likely to be selected. Am I missing something?I THINK the idea is that the leaders exhort their troops to target particular units, so you assign the hits you inflict. Leaders are apparently too tough to hit so they are "targeted" last.
These work for me. They keep the game simple and relatively quick to play.