XF 1.2 Feeder - extracting more elements

The doco : http://xenforo.com/help/feeder/

Shows that you can call the following {title} {content} {author} {link}

What I want to do is feed a "featured product" into my forum. This sort of works in that I can do just that but I also want to call other items of the xml such as the image and the price and the discount (all in the xml).
<enclosure src="http://www.backcountry.com/images/items/small/CPP/CPP0064/BKCHA.jpg" type="image"/>
Question is 2 part:
1) Is there an easy way to include those elements via feeder?
2) If not can I edit the code somewhere to include extra elements like {lowestPrice} {enclosure} etc

I can't find an add on that does this.