Once basic image support is included, and there's some integration with UploadWizard or similar, it should be possible to initialize the upload tool with drag-and-dropped image files.
This would allow simply dragging one or more files from your file manager over to the spot in the document where you want them, ending up with a single image or gallery at the end.
Compared to T40030: Way in VisualEditor to initiate Commons file uploading, and insert image on completion, needs to be able to initialize the wizard with given File objects received via a drop.
See also: T11133: Drag and drop uploading