We have had a recent upsurge of new users who routinely cut and paste or drag/drop images. They really cannot seem to understand attachments and even have difficulty with the relatively easy image upload button that has replaced the IMG bbCode tool on our site.
We seem to have CKEditor 3.6.2 installed and it may be possible to upgrade its cut/paste or drag/drop handling but I am not sure. I think you must be using the same facility here. vBulletin says they will not update CKEditor and have not interest in doing anything about drag/drop problems in 4.2.2.
If VaultWiki supported a more current version of CKEdit and included the simple file upload to attachment via cut and paste, I would be very very happy. Is there any way that could be done?
I put the editor in WYSIWYG mode and dropped a picture here. It it made a mess with a base64 blob, I will delete it.
I see you are avoiding the base64 behavior and this solution may be acceptable but I would rather it were converted automatically to an attachment with a thumbnail.