Hello,
I am a Mac OS system developer, been working with this platform for over 6 years.
For what it's worth, i've been programming on Visual Basic for several years. (although, why not use Objective C here?)
What does your app do with the captured image? Basically as I understand you need the image to be placed into a specific directory? Can I take a look at the ScanSnap SDK? (fujitsu doesnt provide a direct link to download it).