Epson 3800 - Mac OSX Mountain Lion - LFP Remote Panel Inaccessible

Hi, I am having another problem with getting the rear feed (fine art papers) option to be not greyed out. "Destination Paper Size" is greyed out unless the "Scale to fit paper size" box is checked. And I have to get into that dropdown in order to select rear feed under the given paper size. Am I missing something?...Probably, but I cannot figure it out. I want to print the exact size I specify in Photoshop, not simply scale to whatever paper size I am using. Thanks again for any help.