Power foci would still help for anything that requires a roll, such as [Attribute] Boost. Not really worth the expense though.
Adepts in 4th edition have almost no use for foci what so ever. Though there is an (optional) rule in Street Magic to allow an adept to take a geas on a power (i.e. only works in certain conditions) for a reduced cost. -25% I think. Let me grab it.
QUOTE
Adepts and Geasa
For a more adept-driven game, gamemasters may allow adepts to voluntarily take a geas for a specific adept power; in return, the Power Point cost for that power is reduced by 25 percent (round normally). In this case, breaking the geasa only affects that power; the adepts remaining geasa-limited powers are unaffected.
Geas, quick overview and type list:
If an Awakened character cannot fulfill the terms of the geas, then he finds it harder to manipulate magic, effectively becoming less powerful.
When the character takes this quality, he must declare what type of restriction his geas imposes. A geas must be
something that affects all of an Awakened character’s magical abilities and should not duplicate an existing imitation.
If the geas consists of a special action, the character must have performed it within the past 24 hours to fulfill the geas. Likewise, if the geas consists of avoiding an action, then it is broken for 24 hours after the character performs the act.
Listed below are some common examples of geasa that characters can impose on themselves:
Condition Geas: You must specify a personal condition to do magic. For example, you must be astrally perceiving, unwounded, sitting in the lotus position, drunk, and so on. When you’re not in this condition, the geas is broken.
Fasting Geas: If the character eats, drinks, or accepts any nourishment other than water, this geas is broken.
Gesture Geas: This geas requires the character to gesture visibly and freely to work magic. (This does not require the character to spend an additional action; it’s part and parcel of the appropriate Magical Skill Test.) If the character is tied up, cuffed, paralyzed, or otherwise unable to move hands and arms, the geas is broken.
Incantation Geas: The character has to speak, chant, or sing in a loud voice to make magic. If the character is gagged, has lost his voice, or otherwise cannot speak clearly and audibly this geas is broken.
Location Geas: You specify a location where your magic works. Most urban types, for example, choose the city. In any other area, the geas is broken.
Ritual Geas: The character must have performed a specific action within the past 24 hours to fulfill this geas. For example, the character must have bathed in natural spring water, prayed towards Mecca, had sexual intercourse with a partner, or whatever. If this action hasn’t been performed, the geas is broken.
Talisman Geas: The character must use a specific fetish, called a talisman, to perform magic (see p.
81 for rules on creating talismans). To qualify as a talisman, an item must have at least three distinct characteristics
describing it (for example, “a quartz crystal set in a silver medallion, hung on a gold chain�). If the character isn’t prominently holding or wearing the talisman, the geas is broken.
Time Geas: You specify a time when the character’s magic works. If your character uses magic at
any other time, the geas is broken. The time can be day or night, a single season of the year, or a specially
designated time period of observance (summer, for example). Similarly, you can specify a certain time
when the geas is broken (for example, the Sabbath, Lent, or Ramadan).
A talisman geas is pretty close to what your player is looking for, though it doesn't require a foci of any sort, but it could be one.
There's also initiation powers, which I won't go into. There's a few useful ones, but another (optional) rule it to allow initiates to gain an additional power point (thus, points for powers is Magic + Non-metamagic'd Initiations), which your player might want to take advantage of, as there are few, if any, metamagics in the core that are worth taking.