Ah, that's weird. I was under impression that CMA would allow you only to copy over specific data - akin to iTunes, but seems I was wrong. (Or was I? From the link:

  You can display lists of music, image, and video files stored on your computer and transfer the files to your PS Vita system.

That sounds like iTunes-esque thing - is anyone here in possession of Vita and could chime in about this?)

Nevertheless, thanks for that link.