Hi , yes, we set a new position in the sequencer for each frame, and want to fire events forwards and backwards, Matinee does it but Sequencer not yet.
About animating rocks, we wanted to rule out external programs because there are lots of moving elements that have impact on gameplay and we want the game designer to be able to change them quickly on the fly. Doing it with the Persona editor sounds promising, but then I fear we could miss the overall view of the scene, with different rocks moving at the same time. We will investigate further this road, though, so thanks for the tip!