Recently we were playing with some stop start animations.
When uploading our photos into iMovie we were being driven crazy by the Ken Burns effect as it was set on automatically.
I thought others might also be having this problem, so heres the trick!
You need to change your "Project Properties".
Right click your project, and click Project Properties.
Then change your "Initial Photo Placement" from Ken Burns to "Keep in Frame".
Now you can import your photos into iMovie without the Ken Burns effect!
You can also change the length of your photo duration for all photos here as well (great for animation) for help with this in version 10 (purple one) see here.
Goodbye Ken Burns!!!