Um... there is a precedent in "Tome and Blood", the inclusion of
Metamagic Rods, which has a Rod of Quicken Spell listed. I don't have
my books here at work (ah, but wouldn't it be wonderful if I could?),
so I'm going by memory, but I think that it could be used on three
spells cast per day, and had a L17 casterlevel attached to it. Since
any magic item can be combined with another at 1.5x it's normal cost, I
don't see why you couldn't have a "Staff of Quickened Lightning Bolts
3/day" or somesuch.
Honestly, the only spell I use Quicken for is Fox's Cunning, since it
takes up one of my sixth level slots at CL12. I need to get around to
convincing my GM to let me make the focus for Contingency though, so
that I can carry the spell around with a trigger of "When I cast the
Phantasmal Killer Spell" for over a week... >
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