Hi,
you have few options, but in most cases you have to add new module position add use of course it requires of CSS knowledge.
Maybe this guide will help you a little bit:
http://www.gavick.com/documentation/joo ... -position/p.s.
We understand that you want something unique and impressive, like fourth column, and this is custom job but you need take in your mind that customization is not regular Template support.
Maybe in near future when we will update template framework to new version for all templates - adding a new module or column would be easy. Like it's in Meet Gavern template. Right now you have to do it alone.
p.s.
By the way, check this module: JT Fixed Display