Q82c: Are you saying that if a Dwarf Cleric w/ Dwarven Weapon Training (prof. with axes & hammers and +2 damage with them) multiclasses into any arcane class, e.g. bard, and takes Arcane Implement Proficiency, they could use a Khopesh (axe + heavy blade) as an implement for Cleric powers with the +2 damage bonus?
(By the way, thanks to everyone (ve4grm, masteraleph, MwaO, Yakk) for the detailed answers!)
EDIT: It appears not, since "Choose a kind of implement associated with any arcane class. You can use that kind of implement with your arcane powers." So only for arcane powers.