Reply to your suggestions
1. So basically you want the scoundrel/rogue archetype to become this mix between physical and magical. As someone with a skewed opinion on the archetypes strength i'd find it slightly annoying because it removes alot of the value from crits.
2. This i agree with since the huntsman skill gives +5% highground and elemental arrows damage it works perfectly for dealing with both magical and physical.
3. At least 30% of the bows/crossbows i come across have elemental damage attached to them so im unsure on this
4. Hm i feel making it magical armor is slightly more advantageous for the skill because a mage with range would have an easier time chasing down the fleeing chicken than a melee fighter.
5. Whilst making a change like that is something i agree with such a thing may spawn a viable physical damage based mage.
6. totems are fine as they are since you can choose/build around certain elemental totems.