There is a topic with all the details of how to transform a products page into two columns (or more, for that matter) -- and the same logic applies to the features page.
I did it to my features and my upsell templates. OK, well, actually, I made a new features template because I still wanted the products.tpl to be single column. And the two, features and products, use the same template in the default X-Cart.
Anyway, let me see if I can find the link for you. The topic was right on the money and had me getting it working in no time flat.
This should be it:
http://forum.x-cart.com/viewtopic.php?t=287&start=0&postdays=0&postorder=a sc&highlight=products%20tpl
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