How does dream board determine what orientation a theme is displayed?

I am using the iPad midnight theme and it is in landscape which I want, but I want it flipped the other way so when holding it the ipad home button is on the left (not right). I want it this way because the case I use is the basic iPad case so in upright stand mode the theme displays upside down. I know dream board doesn't support rotation, but if I could edit something to permanently display it in landscape the other way around.

Is there any way to accomplish this?