Disable Thumbnailing and drag original image into fck

Hello,

I'm using CKFinder and FKCEditor with PHP5. I've got the following problem:
I've got my own thumbnail class, so CKFinder don't have to create thumbnails. But if I disable thumbnailing in the config file, I don't see any thumbnails anymore. Is it possible to fill the CKFinder with my own thumbnails?

Next problem:
If I drag an image from CKFinder into FCKEditor, not the original image is placed into FCKEditor but the thumbnail....any idea how to fix these problems?

Thanks in advance.