That actually worked great - I followed your instructions, and I was able to go offline with the iPod touch, add a flight, save it, and a little "1" appeared next to the icon for the logbook app. I went online with the touch, manually synced, and when I synced on the desktop version of Logbook Pro, the flight was added. What is the reasoning behind adding the "TEMP" field in Logbook Pro? I probably shouldn't ask, because for whatever reason, it worked.
Thanks for getting back to me so fast. Looking forward to some serious enhancements on the app side - Crew library, ship library (tail numbers, etc.) and stability! Definitely headed the right direction.