I suggest a library so we don’t have to constantly import or objects and can just drag and drop them on to the stage
I’m not sure about this.
I think Pencil2D should be rather a sketch softaware than tools like Toonboom, Flash or After Effects, that are oriented towards layers and objects…
Or a lest, for a start.
There is too much to do first before focusing on a library, in my opinion 
Thans for the feedback anyway !