Thanks Nate. I am not sure i explain correctly what i do... All my images have bones. Sometimes, i need to move a particular vertex. I don't use a bone to move this particular vertex. When i move this vertex, Spine create a key (normal). But in the first key, it doesn't. So what we do ? in the beginning of the work, we create a key for all bones for the first key and after, for each image, select all the vertes, move them for create a key. Even if i love Spine, it is really boring to do that.
By the way, in the meantime, i found the trick : move the vertex you want and after make crtl+shift+L. It create a key for the vertex of the image at the first key ๐
Another time : Spine is a great tool ! ๐