One positive thing: freshly ingested DV tapes recognize and display the time and date they were shot, not just ingested. Fantastic to see my ancient tapes ripping in with dates from 1999.
Another poster alluded to this, but if you create a new Transition in Motion, then save without making any changes, that *is* an audio-only transition. Give it that name when you save, in a Category for your own Transitions (I use Experiments).