Well I had something sort of working,
But Hype chose to crash on me as I was saving it.
So I cannot be A.'d to do it all again.. sorry.
A couple of things.
Instead of using opacity.
Now lets say I have 11 rotations.
I went to the 12s keyframe and changed the image background to the first image.
I then worked forward 1 second and changed the image background.
1 second after the last image change. I placed a timeline action to go to 12s keyframe.
I then went back to the 12s keyframe and worked in reverse (counting down) and changed the image background every second until the last image.
then place a timeline action to go to 12s keyframe at that end.
In the main scene. I set up the drag (reverse) and a unload to go to 12s keyframe on the time line.
The reason for the change background instead of the opacity, is you get no blurring of image transition.
Note; I do not think that the way I was doing the rotation ( i.e a mirror ) is going to work really fantastic, because it seemed slower loading. But maybe if the images are small enough this may be mitigated ?. ( which was what I was going to try next before the crash)
Anyway an idea.