To actually answer your question though I would see that as an attempt to take the power or stunt without actually paying for it. Consider the fact that enchanted items can be used multiple times per scene for only one mental stress per use beyond the first, and that's if the caster hasn't devoted some shifts to additional uses. Considering that could essentially grant you the use of that power/stunt for the majority of every scene, it seems really unbalanced. If you want the power/stunt then take it, pay the refresh, and justify it as an aspect of your magic.
To be honest I don't like the idea of using a magic ritual to gain powers that you aren't paying refresh for.
EDIT: To clarify: giving yourself a -1 power costs a FP. The same would apply for a stunt. Maneuvering has no such cost attached, which is rather important. That being said, 3 complexity per point is pretty cheap. It's meant to be, because the FP cost is so much more important than the complexity.
@computerking:
I'm not sure I'd even allow magic to add stunts at all. Powers, fine. Stunts, no.
But you gotta pay FP for them if they are allowed.
I don't think that an enchanted item granting a power or a stunt is terribly practical, really. You'd need a lot of power and a lot of FP. Plus, they might well take too long to work. GM fiat situation there.
OK. Let me try to come up with a compelling argument through examples.
Example 1: The Sword of the Cross, an Item of Power grants its user True Aim.
True Aim. When swung in keeping with its purpose, a Sword of the Cross grants a +1 to the wielder’s Weapons skill.
Despite its Power-based origins, this is basically a Stunt. It sets the precedent of a "power" granting a Stunt. (Note, I will call back to this example later)
Example 2: The Shape-shifting power Mimic Abilities has a power Trapping called Mimic Stunt:
Mimic Stunt. You are able to clone any of your target’s mortal stunts. You must clone these abilities by temporarily paying for them out of your mimic points (above).
Another incidence of a power granting a Stunt. It's a trapping of another power, yes, but no FP is needed to use the granted/copied stunt, because using that stunt is a part of that power. If a power was conceived that consisted of only Mimic Stunt, would its cost be lowered to (Mimic Points) minus 1? What if it could only be used once, and could not be changed?
(Another argument might come from the fact that this trapping does not specifically state that you need to meet the requirements of Eat Power to do it, but that's another argument for another day)
Example 3: There has been much talk about Ectomancy lately, in the wake of Ghost Story.
I believe that it may be possible for an Ectomancer to gain not only the skills, but also the stunts of the spirit that he allows within him.
Just putting in another possible power that has the potential to grant Stunts
Example 4: Channeling, Ritual, Evocation and Thaumaturgy all cost Refresh, and part of their trappings include 2 Focus Item Slots, which can be changed into 4 Enchanted item slots. Likewise, Refinement can be chosen to grant 2 Focus Item slots. I put forth that because these slots are part of a power, and that power is paid for with refresh, than those slots are already paid for with refresh. So an effect of an Enchanted Item is already covered, cost-wise, by sacrificing the ability to further enhance your spellcasting, and instead choosing to have a single repeatable effect in an enchanted item.
Example 5: An Item of Power (See, I told you I would call back to these) grants
one or multiple ongoing powers for a small discount in an
unbreakable object that can be transferred to another for 1 FP per
scene for all of its powers.
An Enchanted Item grants
one effect for a
limited number of uses, in a
breakable object that
cannot be transferred to another without reducing its power at the time of its creation. If this were an Item of Power derivative power, how huge would that discount be?
To sum up, There is the potential for Stunt granting in many powers, Stunts are inherently less powerful than powers, and are also inherently easier to come across in characters (Even Pure mortals can have them). To forbid an enchanted Item, which can potentially be made to cast any Evocation or
Thaumaturgy spell, from granting something so mundane as a stunt is a little heavy-handed on the ban stick, in my opinion.
And sometimes I believe the imposition of a Fate Point per use cost for magically granted powers may be a bit egregious as well. You could transform yourself into a Troll, for example, but couldn't lift a fat kid without spending at least 3 Fate Points every time, Or every scene (Huge size and Inhuman Strength)? Sometimes it seems that a well-prepared wizard couldn't be a force to be reckoned with in the games you guys run.