Ok I got it working. What I failed to mention the first time is that I had tried using ExtendedUIHoverTime in the registry and it didn't appear to work. Except, my attempt was with Start11 installed and running. This time I uninstalled Start11, restarted, set ExtendedUIHoverTime and tested. No thumbnails, yay. Then I crossed my fingers and installed Start11, and still no thumbnails, double yay. So the trick for me appears to make the change while Start11 is not installed. I saw what you had tried, noticed you had uninstalled, and realized I hadn't tried that. So thanks for your help!
