So I've got a character bouncing around in my head that's been demanding a bit of leeway from the usual rules in order to be properly represented, so I figured I'd pass some of those altered rules by the folks here to get your opinions on how they might (or might not) adversely affect game balance.
the character:
a young, somewhat underachieving, (apprentice) wizard prodigy who takes Dresden's 'without my foci, it would just be too dangerous' schtick to an extreme (actually having an aspect being called, for the moment, 'without my foci, I'd kill us ALL')
I've modeled this, mechanically, by giving him full Thaumaturgy, and several Refinements, but neither Evocation nor even Channeling, then devoting substantial specialization and focus slots to Crafting, while flavouring those items as incredibly dedicated 'foci' for his 'evocation' spells, including his 'potion' slots, which I've flavoured as foci that 'burn out' after just one or two uses
To aid the consistency of these items being foci for evocation, and not actually storing spell energy themselves, though, I've performed a bit of a reverse of one of the usual enchanted item options. Instead of reducing the power to increase the frequency, I've dropped the frequency to 0 - instead relying on that
oft-forgotten option to pay mental stress to gain extra uses of items - increasing the power by a commensurate amount.
So...that's the biggest workaround that this character would be using.
Beyond that, I'd been intending to invoke-for-effect 'without my foci...', probably while simultaneously handing the gm a pre-approved compel, to lay down the occasional mostly-indiscriminate destruction in the style of zone-wide evocation attacks.
I'm not quite set on the details of how to implement this one, though, beyond the base concept, but even Channeling seemed to expensive for what I had in mind (basically a single spell effect at significant cost of collateral damage, without justification even for having an enchanted item 'focus')