adding image add-on filters ( file type or size )

I would like to suggest the idea of adding some filters to the image import add-on.

Presently, all images are sucked in from the original post and one is selected as the featured image - in some cases the image selected is tiny ( nearly always this is a gif image - such as a emoticon or an old school trany.gif spacer image ) - the end result is not ideal - this happens every day or so, using the following feed from a wordpress.com site:

http://greenhearttravel.wordpress.com/feed/

Are there any existing hooks in the image add-on that could be used to filter the image selected as the featured image or can you think of any good work-around for this?

Thanks in advance

Ray