9) Backpacks are best for it. Stuff like arrows will be put there automatically, if the character has already one example in it.
10) It would be pointless, if you could win every argument just because you can always use your main stat to solve it. Different situations have different persuasion stats.
4) Leadership has sadly a range of only 5 meters.
5) Bracchus boots are cursed with crippling effect.