The features you are requesting, such as global offset, motion trails, bookmarks, and animation layers, are not currently available in Spine as you described them. However, there are some related discussions and feature requests that have been noted by the Spine team. For example, there is a request for a non-destructive offset for secondary motion, which might relate to your global offset need. You can find more about this in the GitHub issue here. Motion trails have also been requested, and you can follow the discussion here. As for bookmarks, there is an idea to add timeline markers, which you can see here. Lastly, while animation layers are not directly supported, there are plans to improve the Preview view to allow for more complex animation editing, which might offer similar functionality in the future. You can follow the progress on this feature here.