Ken Burns Effect in AA

My slideshows are usually made up of a mix of 16:9 and 4:3 images (with some multi image slides here and there). When applying the Ken Burns Effect, the Animation Assistant currently only offers the option of one or the other. I have to do it manually, or a few at a time if there is s run, and this can be time-consuming. Any chance of it being automated when there are both?
Also, please add the Mask option to the Animation Assistant.
(By the way, I could not give this thread the title “Animation Assistant”: got a message saying it was using the same letters over and over!)