I use a Canon Pixma Pro 100 which prints 13 x 19" prints. I don't have any trouble at all printing them from Lightroom. What do you mean when you say that you have to jump through a hundred hoops to do it? Have you gone into the page setup dialog which opens up the Epson printer dialog so that you can configure the paper size and other settings? What are the problems you are experiencing?
I use an Epson Stylus Photo R2000 which prints 13x19 and like JimHess, I don't have any trouble printing from Lightroom. We need more information. Exactly what happens when you try to print? Give us more details, screenshots of the Page Setup and Print Settings would help.