The polearms are masteries are required because Drizzt is a master of all forms of weapons, not because he would actually use one of them. However, I may allow him to use one for one of his quests?
Bow is allowed, if you are going to play him using the ranger rules. Otherwise, I was going to play him as a sword-only Barbarian, because it is more challenging to not have a ranged attack. Please note that as I don't have the 1.10 beta, this was made entirely without boosters in mind. But, I would have to say that yes, pumping a skill for its boost is fine, as long as you don't actually USE it.
Cattie Brie is an amazon (that way you can have her as a merc). Wulfgar is naturally, a barbarian (shame you can't give him a warhammer though), and maybe the dwarf can be a thorns merc?