please please please add an undo feature. I once again deleted more photos that i intended from a batch I had just opened; The only protection I have is to NEVER work on originals, but work on copies and then when I make a mistake, i can go back to the original. This is a total nuisance. There needs to be a way to undo a delete action when dragging selected photos to the trash--just like the Mac system allows one to open files from the trash before emptying it. If this can't be done, I am going to have to revert to processing my photos in Bridge before putting them in PM--which is also a nuissance!! PLEASE!!!