14. When do a Magic Item's keywords apply?
If you use a magic item's power in conjunction with a power granted to you by your race or class, that item's keywords are added to the regular keywords of the power you are using. For example, if you are have a Flaming Weapon, and you use an at-will power to attack an enemy along with the at-will power of the Flaming Weapon, your attack will have the Fire keyword in addition to the normal keywords of your attack. You have to be using the powers of the weapon for those keywords to be added; simply using the magic item does not necessarily mean every keyword attached to a power of that item will be added.
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Emphasis mine.
This seems to point to using a weapon as an implement, you do get the power.
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16. When you are using a magic weapon as an implement, like a Holy Avenger or a Pact Dagger, what benefits do you get from the weapon?
You gain any bonuses listed under Enhancement, Critical and Property.
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Does this mean my implement attack just became "High Crit"? It's a property...
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17. I am using a weapon as an implement, like a long sword for a Wizard of the Spiral Tower or a Quarterstaff as a staff implement, do I gain the extra damage from feats like Weapon Focus?
Yes, you do gain this bonus to damage.
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Thought this worth noting...
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I'm no expert rules lawyer, just putting evidence out there.