Be able to do a content template for the Feed Entry Description Source

We've been thinking about blog feed content and after grading a few of our clients blogs we're noticing that because we're not including images in the content (we have separate attributes for them and they are then floated in the Content Template) the grader is marking us down because of it.

Is it theoretically possible to have more than one attribute go into the Feed Entry Description Source? It would be great to be able to combine e.g. Post Content, Image, Image ALT Tag and Image Caption attributes to create a 'hybrid' Description Source....