One area that I use the timeline and find it sometimes difficult is to match a slide to a particular point in the music. I have also been known to adjust the transition to fit the music as well. This requires the shuffling of all future slides sometimes in either direction, or just a shuffling of one. I only ever use the automatic fit to music duration as a starting point everthing else is manual. In fact I have on quite a few occassions editted the music to fit the slide show. So really my hopes are that being able to use modifier keys to control how the slides and transitions interact is important to me as well as being able to preview quickly just portions of the presenatation. Not sure if this description of using the timeline helps. One thing i have just found usefull was the TV safe zone so thanks for that.