I am using a Canon 7D and it seems most of my photos come out over exposed/developed when I use auto tone, not always, but often when I have a light background, such as a cloudy sky or yellow grass or highlighted field. You can see the highlights are blown on the curves chart. Seems that your auto tone algorithm would be able to avoid that. I tried the lightroom version 5 beta and it is the same as 4.3. I shoot raw so I process all photos and a one button fix that works would be great (maybe one customized per camera profile?). Also, it would be nice if sharpen/noise reduction could work in conjunction with this or have a separate auto button that could optimize the trade off between these two, giving the best detail with least noise.