To me it is difficult to see how all animations fit together and I think maybe a timeline would help, something like this:
Each would be a single animation and it could even be sectioned into slides so you could 'scrub' through the whole Xplain. It would also declutter the tool bar as you could remove the Duration/Delay/Pause/Reorder etc.
I come from using editing software a lot so it makes sense to me, but I understand that it may seem against the 'simple, easy, fun to use' pick-up-n-play approach Xplain is aiming for. Like I said, just an idea...
