Can something like this be done with img_assist?

The biggest thing I like about IMCE over img_assist is that it extends the existing 'insert image' UI, rather than adding another semi-redundant button to TinyMCE's toolbar.

What I'd really like is to link a remote image from within the same UI as img_assist. I'm picturing this as a window with three tabs:

1) Link to image (default)
This screen has a URL field for the image you want to embed, plus controls for size, alignment, etc. (or no extra controls, depending on permissions set by admin)

2) Browse images
About like the current browse images screen, but instead of taking you to a new screen when you click the image, it instead switches you back to the first tab and places the appropriate URL in the link field.

3) Upload a new image
Pretty much the same as img_assist's current upload screen. It would be nice if it would default to the file's name if no title were specified. :)

I just think this would be a lot easier from a user's standpoint than having separate interfaces for embedding local/remote images. Is there a way to do something like this without a rewrite of img_assist?