I'm claiming that the implement Staff is a different critter than the weapon Quarterstaff, even if the implement Staff can be used as a Quarterstaff weapon (due to a specific rule saying that it can).
For one thing, a Staff implement is one-handed, while a Quarterstaff weapon is two-handed. Can you cite a rule which allows me to use a Fullblade as a one-handed implement -- or cite a rule which prevents me from doing that?
The handedness of a weapon has nothing to do with wielding that item as an implement. One is the rules for using a weapon as a weapon, handedness does apply. The other is using an implement, which only requires that you hold it.
But, do notice question 17 from the source you mentioned:
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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So by the very source you mention, Quarterstaves can, in fact, be used as an implement.
Thanks for finding that for me!
You can't, because the rules are incomplete in this area.
Since you said "please", I'm happy to provide.
Question #16, from the FAQ for the Player's Handbook, right here:
FAQ for the Player's Handbook!
Cheers, -- N
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.
Notice something here.
1) Nothing in the answer addresses the powers of that weapon. It does not say you cannot use powers of a weapon.
2) It only refers to bonuses. Powers are not bonuses, so an inclusive list of legal bonuses is not refering in any way to powers.
So, I ask you again. Please point out where powers of weapons are restricted solely to weapon powers. I have found no such restriction.
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also, sent to CS:
Let's say I have a Frost Weapon enchantment on my Fullblade, and I am a swordmage. I then use the at-will power of the Frost Fullblade to make all damage done by it cold damage.
If I do this, does this change the damage of my implement powers that I use with the Fullblade, or just the weapon powers?
And if only the weapon powers, why is that?
Does this change if I'm a Druid with a Frost Staff?
And if powers on weapons can only be used with weapon powers, then how does a Tooth of Chaos work, exactly?
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Book Name: Player's Handbook