Can I disable image size attributes?

I make all of my graphics to size and I save them as AI files. When I link them into FrameMaker (11 / DITA1.2), it adds height and width attributes (in POINTS, of all things) based on the native size of the image. That's fine. However, I have had to resize graphics on a few occasions, which means the size attributes cause problems--the graphic frame is now too big or too small.

Can I get FrameMaker to NOT put in the height and width attributes, and just always bring a graphic in at its native size?