i would guess so as well, and it would be a good point why duplication
is bad (you don't see when something is missed in one place)

i think you need to do stuff to activate the imagine slideshow in the
sandbox, its not demoed (yet) though it should. if its too much hassle
right now, lets leave it and we will see what happens once somebody
finishes https://github.com/symfony-cmf/cmf-sandbox/pull/189