For example I need to edit multiple emitter, inside the sequencer I want to add a visibility track to all of them I need to right click and do that one by one, then check the visibility one by one… is very laborious. I try to put them on a folder, but is not possible to add a track on the folder. H…

This isn’t possible at the moment. Your suggestion is pretty reasonable. We’ll see if we can add it to a future release. Thanks.