1. I don't see why not.
2. When you use the bane ability it only applies to one weapon, but there is a feat that lets you do two weapons (Double Bane) but it uses up two of your rounds of bane for each round. It would be better to just use hand crossbow (if you were set on using them) and take Rapid Reload (which is pretty much mandatory for a dedicated crossbow wielder) and Rapid Shot.
Misunderstood you, as in I thought you meant dual wielding hand crossbows. Have no idea for that, but since it doesn't have the "double" property (which I believe would only apply it to one end), I don't see why it wouldn't work.
1) Can a druid in wild shape have natural attacks by rage powers? Such as beast totem? Example: a raging druid shaped in an earth elemental with 2 claws, 1 gore and 1 bite attack, other than 1 normal slam attack for the elemental form.
The polymorph school description, which covers wildshape, specifically says that features "that allow you to add features (such as sorcerers that can grow claws) still function". Which seems to answer you question.
Critical hits, sneak attack damage, and other precision-based damage only apply to the first bolt.
It would be a pretty reasonable assumption that all bonus damage only applies to the first bolt. However, as stated, that's not the case. Bane is not precision-based, nor is it a critical hit or sneak attack. Therefore, RAW, it seems to apply to both bolts. I wouldn't allow it, but you should talk to your GM.