Suggestion : Dynamic Keywords List
Back in the Ol' days, Picasa had a really REALLY nifty function.
When you were tagging your images, the top of the keywords list was always populated with the most recently used keywords. This was a good help when you were going through a lot of pictures with the same couple of keywords. You didnt have to scroll up or down the list for the same keywords all the time. "Ice-cream", "Bluesky" and "Friends" were always on top. It greatly improved the speed at which you could tag multiple images.