It's clear in the rules that evocation Focus Items apply specifically to either Defensive or Offensive evocation.  But, does that mean we can't use Foci for non-combat evocation?  This might include things like Harry's "Flickum Bicus," which are certainly quick-evocation, but also don't really have a combat purpose.  One might argue that it's not worth even bothering using the evocation mechanics for trivial spells like that, but non-combat evocations are not necessarily trivial, and could mean the difference between life and death.