Pretty sure that fast casting ignores the stacking cap for all effects. The stacking cap for cast time and recharge time only applies to benefits from skills/effects/items, similar to how the armor stacking cap works.
There are a few bugs related to armor stacking though, so it wouldn't surprise me if there were a few related to fast casting stacking as well.
In any case, the stacking would be multiplicative so the actual benefits would be a lot less than what you would expect. Weapon of Quickening would only knock off about 16-20% from the base recharge time on average.
Last edited by Kunder; Jan 30, 2012 at 10:48 PM // 22:48..
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