here's something to chew on, maybe...
there's a logcat difference between the two animations
with fancy rotation:
I/WindowManager( 88): Setting rotation to 1, animFlags=128
I/WindowManager( 88): Setting rotation to 1, animFlags=0
can anyone make any sense of the animFlags value and what that may correspond to? makes me think that maybe the animations are simply included in the system and just are hidden and not enabled. and spare parts probably just allows us to change a few more settings in the system, not installing or adding any transitions itself.