Welcome to the site! You've posed some good questions and had some good answers but thought I'd chip in too!
1) The simplest thing to say is that you can stand on the edge as long as you can place the model on the edge. If you're beign strict with the rule that you need to back away a full inch then yes, in your example Bombur would go over the edge.
2) Rules as Intended it's very clear, like every model they have a hand weapon but they can't special strike with it as you don't know what it is. Like you say, the small axes are obviously meant to be their throwing axes. However, certain players would argue that there's nothing to say that's not just a small axe hand weapon and so it would be hard to prevent someone from special striking with it. That's up to you to decide what kind of player you want to be though
3) The common consensus is that you can indeed to this, it's how the game has commonly been played: P.43 of the rulebook states that in a multiple combat "the winners each make their strikes against the loser in an order chosen by the winners' controlling player". It's a good tactic, it works well when fighting cavalry models too, kill the horse, rider might be prone = double strikes etc.
I recently heard someone say that somewhere the rulebook states that all strikes count as being resolved at the same time which would overrule this - I can't seem to find the sentence though
4) This is tricky - whilst I can see where JamesR and Gwaryan are coming from I think he can shoot. Failing a Terror test states the model can't move, it doesn't say he counts as having used all his move. Similarly, the Shooting rules specifically state that you can't shoot if you have failed a Jump, Leap, Climb or Swim test or if you are Prone. It makes no mention of failing a Terror test. Similarly, if a model is in range of a Heroic Move but can't finish their move within 6" of the Hero or that chooses not to move as part of the Heroic Action, then they can't move for the turn (just like a model that failed a Terror test), can they shoot? I'd say yes again. Definitely a grey area though.
5) Yep, he can cast at anyone within range, if only he had Sorcerous Blast!
No need to apologise for the post, much better to ask a bunch of questions together than to start 5 threads!
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